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What Is a Complex Sentence?
A complex sentence contains one independent clause and at least one dependent (subordinate) clause. The dependent clause begins with a subordinating conjunction like "because," "although," "when," "if," or "while," or with a relative pronoun like "who," "which," or "that." For example: "Although the test results were promising, the team decided to run another trial."
Complex sentences show relationships between ideas, such as cause and effect, contrast, or time sequence. They're essential for mature, nuanced writing. But when sentences pile up too many dependent clauses, they become hard to parse and should be simplified.
Complex vs. Compound vs. Simple Sentences
Simple Sentences
A simple sentence has one independent clause: "The report is finished." It's clear and direct, but using only simple sentences makes writing feel flat and monotonous.
Compound Sentences
A compound sentence joins two independent clauses with a coordinating conjunction (for, and, nor, but, or, yet, so): "The report is finished, and the team submitted it." Both clauses could stand alone.
Complex Sentences
A complex sentence makes one idea dependent on another: "Because the deadline moved up, the team submitted the report early." The dependent clause ("because the deadline moved up") cannot stand alone as a complete thought.
Common Issues the Checker Finds
Too Many Nested Clauses
Sentences with three or more dependent clauses often confuse readers. The checker flags sentences with excessive subordination so you can break them into shorter, clearer statements.
Misplaced Dependent Clauses
A dependent clause placed far from the word it modifies can create ambiguity. "The manager approved the budget who joined last month" should be "The manager who joined last month approved the budget." The checker highlights these misplacements.
Lack of Sentence Variety
If every sentence in a passage is complex, the writing feels dense. If none are, the writing feels simplistic. The checker shows your sentence-type distribution so you can aim for a healthy mix.
Paste your writing above to see each complex sentence highlighted, with clause boundaries marked and suggestions for any that need simplifying.
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Try our grammar checker to catch errors automatically, or use the paraphrasing tool to improve sentence clarity.