A complex sentence that has two subordinate clauses connected by a conjunction is true.
A complicated sentence consists of one or more clauses which might be a mixture of two or extra important clauses, or a combination of principal and subordinate clauses. A chief clause is a clause that makes feel on its own and also can exist in a sentence on its own.
Complex sentences are sentences that have clauses. There may be two independent clauses (each having a topic and predicate), or an unbiased clause and structured clause (lacking a subject or predicate). Whether or not a comma is used between them depends on the kinds and positions of the clauses.
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