The difference between Complex sentence and Simple sentence
When used as nouns, complex sentence means a sentence that contains an independent clause as well as one or more dependent clauses, such as a relative clause, an adverbial clause, or a noun clause, whereas simple sentence means a sentence that contains one independent clause and no dependent clause.
check bellow for the other definitions of Complex sentence and Simple sentence
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Complex sentence as a noun (grammar):
a sentence that contains an independent clause as well as one or more dependent clauses, such as a relative clause, an adverbial clause, or a noun clause.
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Simple sentence as a noun (grammar):
A sentence that contains one independent clause and no dependent clause.