9.5 Coordination, Subordination, and Sentence Combining for Syntactic Variety

Coordination, Subordination, and Sentence Combining for Syntactic Variety

OpenExamPrep provides this instructional guide to sentence combining, coordination, and subordination to help students master syntactic revision on the Texas Success Initiative Assessment 2.0 (TSIA2) English Language Arts and Reading (ELAR) section. A core benchmark of college-level writing readiness is syntactic maturity—the ability to move beyond short, repetitive, primer-style sentences to construct varied, rhythmically sophisticated prose. On the TSIA2, sentence-combining questions require you to fuse two or more short clauses into a single, elegant sentence that clarifies the precise logical relationship between ideas without introducing grammatical errors or distorting the author's original intent.

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1. The Objectives of Sentence Combining on the TSIA2

Examinees frequently encounter questions asking: "Which choice provides the best combination of sentences 4 and 5?" To answer these items successfully, you must understand what test developers are evaluating:

1. Eliminating Redundancy: Removing repeated subjects, pronouns, and unnecessary linking words.
2. Establishing Precise Logical Relationships: Making explicit whether clauses share an additive, causal, concessive, temporal, or conditional connection.
3. Creating Syntactic Hierarchy: Subordinating minor supporting details while keeping the main assertion in the independent clause.
4. Preserving Grammatical Integrity: Avoiding newly introduced errors such as comma splices, dangling modifiers, or awkward passive constructions.

+-------------------------------------------------------------------------+
|                    CHOPPY PRIMER STYLE VS. MATURE SYNTAX                |
|                                                                         |
|  CHOPPY ORIGINAL DRAFT (3 Simple Sentences):                            |
|  "The marine biologist tagged thirty juvenile loggerhead turtles.       |
|   She used satellite-linked acoustic transmitters.                      |
|   She wanted to map their pelagic migration routes across the Atlantic."|
|                                │                                        |
|                                ▼                                        |
|  SYNTACTICALLY MATURE SYNTHESIS (Appositive & Participial Reduction):    |
|  "To map their pelagic migration routes across the Atlantic, the marine |
|   biologist tagged thirty juvenile loggerhead turtles using             |
|   satellite-linked acoustic transmitters."                              |
+-------------------------------------------------------------------------+

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2. Coordination: Symmetrical Weight and Equal Semantic Hierarchy

Coordination joins two or more clauses of equal grammatical rank and conceptual weight. When two thoughts are equally important, use coordination rather than subordination.

Coordinating Conjunctions (FANBOYS) and Their Logical Functions

Selecting the wrong coordinating conjunction alters the logical connection between propositions:

Correlative Conjunctions

Correlative conjunctions work in matched pairs to establish symmetrical comparisons: not only...but also, neither...nor, either...or, both...and. When combining sentences with correlatives, maintain strict parallel structure:

• Faulty Parallelism: The new transit policy not only reduced traffic congestion, but also the air quality was improved by it.
• Parallel Synthesis: The new transit policy not only reduced traffic congestion, but also improved regional air quality.

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3. Subordination: Semantic Hierarchy and Logical Connectors

Subordination establishes a clear hierarchy between ideas by turning one proposition into a dependent (subordinate) clause. The most critical information remains in the independent clause, while supporting context, causes, conditions, or concessions are subordinated.

Functional Categories of Subordinating Conjunctions

• Causal Relationships: because, since, as, given that
  • Example: Because excessive nitrogen runoff induces toxic algal blooms, agricultural agencies restrict seasonal fertilizer application.
• Concessive / Contrastive Relationships: although, even though, while, whereas, despite the fact that
  • Example: Although the geothermal turbine required substantial upfront capital, it generated power at near-zero marginal cost.
• Temporal Relationships: before, after, once, until, whenever, as soon as
  • Example: Once the centrifuge reached 10,000 revolutions per minute, the viral particles separated from the serum.
• Conditional Relationships: if, unless, provided that, assuming that
  • Example: The flight test will proceed on schedule provided that regional cloud ceilings exceed 3,000 feet.

⚠️ TSIA2 Warning: The False Subordination Trap

Make sure the subordinate clause contains the secondary thought, not the primary assertion. If an author's main point is that an endangered bird successfully nested, do not subordinate that achievement: "Although the condor hatched a healthy chick, it built a nest on a rocky cliff." The survival of the chick is the climax, not the concession!

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4. Phrasal Condensation: Participial and Appositive Embedding

The most elegant sentence-combining strategy on the TSIA2 involves reducing an entire clause into an embedded phrase, eliminating redundant verbs and pronouns entirely.

Strategy A: Participial Embedding

Transform a secondary clause into an introductory or nonrestrictive participial phrase.

• Original Sentences: Dr. Chen analyzed the ice core specimens. She identified an abrupt spike in atmospheric greenhouse gases that occurred 8,200 years ago.
• Participial Synthesis: Analyzing the ice core specimens, Dr. Chen identified an abrupt spike in atmospheric greenhouse gases that occurred 8,200 years ago.

Strategy B: Appositive Embedding

Convert a sentence that merely defines or identifies a noun into an appositive phrase.

• Original Sentences: CRISPR-Cas9 is a revolutionary gene-editing technology. It allows molecular biologists to alter DNA sequences with unprecedented precision.
• Appositive Synthesis: CRISPR-Cas9, a revolutionary gene-editing technology, allows molecular biologists to alter DNA sequences with unprecedented precision.

Strategy C: Prepositional and Absolute Phrasal Condensation

• Original Sentences: The hurricane made landfall on the barrier islands. Its barometric pressure had plunged to 920 millibars.
• Absolute Phrase Synthesis: The hurricane made landfall on the barrier islands, its barometric pressure having plunged to 920 millibars.

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5. The Four Traps in TSIA2 Sentence Combining Questions

When evaluating sentence-combining options on the TSIA2, eliminate choices that commit one of four classic errors:

1. The Meaning-Distortion Trap: The combined sentence alters the logical relationship between the original ideas—for instance, making a cause appear as an effect, or turning a contrast into a simple addition.
2. The Grammatical Corruption Trap: The combined sentence introduces a new structural error, such as a comma splice, a dangling modifier, or a sentence fragment.
3. The Wordiness and Passive Clutter Trap: The combination uses convoluted phrases ("due to the fact that it was carried out by...") or weak passive voice where active, concise verbs exist.
4. The Loss of Academic Register Trap: The combination connects clauses with excessive, informal coordinating conjunctions ("and...and...so"), creating an immature run-on sentence.