THE COMPLEX SENTENCE 

     1. DEFINITION.

A complex sentence consists of an independent clause plus one or more dependent clauses. It always has a subordinator like because, since, after, although, or when or a relative pronoun like that , when, which, or who.

     2. EXAMPLES OF COMPLEX SENTENCES.

             a. When I was chatting with my friends on facebook, the light went off.

             b. The team are training very hard, because they will have a very important match.

             c. This is the nurse who looked after me in the hospital.