A complex sentence is defined as a sentence that contains an independent clause and at least one dependent clause, joined by a subordinating conjunction.
Here’s a brief overview of the options you provided:
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True Definition of a Complex Sentence: An independent clause and at least one dependent clause joined by a subordinating conjunction.
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Sentence with two or more independent clauses joined by a subordinating conjunction: This is not a correct description of a complex sentence.
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Sentence with two or more independent clauses joined by a coordinating conjunction: This describes a compound sentence, not a complex sentence.
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Sentence with an independent clause and at least one dependent clause joined by a coordinating conjunction: This is incorrect for a complex sentence, as coordinating conjunctions join independent clauses.
So, the correct definition is the first one you provided.