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a sentence consisting of only one clause, with a single subject and predicate is a simple sentence
a sentence with more than one subject or predicate is compound sentence
a sentence containing a subordinate clause or clauses is complex sentences
Simple sentence has one main may have phrase and clause
compound sentence must have two main clauses combining with coordinating conjunction.
complex has one main clause and one or more subordinate clause .the subordinate clause depend on the main clause by using subordinating conjunction