Answer and Explanation:
An example of an original sentence that is complex is: “He slapped her, and they ran out of the class”.
Complex sentences are sentences that have an independent clause, and one or more dependent clauses. The complex sentence given above has one dependent clause and an independent clause.
The dependent clause is: “and they ran out of the class”. A dependent clause has a subject (they) and verb (ran), but cannot stand alone because it doesn't give complete expression. The presence of “and" makes the clause unable to give complete expression.
On the other hand, the independent clause is: “He slapped her”. An independent clause has a subject (He) and verb (slapped) or predicate, and can stand alone because it gives complete expression.