The subordinate clause:
A complex sentence is a sentence made of two clauses joined together by means of a subordinator i . The sentence part that has been made subordinate is called a subordinate clause. Sentences are reduced to the status of subordinate or dependent clauses by placing subordinators before them. These subordinate clauses function in the sentence as nouns (noun clauses), adjectives (adjective clauses), or adverbs (adverb clauses).