Simple Sentence:
one subject and one predicate-verb
Compound Sentence:
one/more independent clauses (or simple sentences)
and linked by coordinating conjunction (and, but, or, etc.) / by a semicolon without a conjunction
Complex Sentence:
one main clause and one/more dependent(or subordinate) clauses
Compound-Complex Sentence:
at least 2 main clause and at least 1 dependent clause