The document discusses subordination in sentences. Subordination is a grammatical strategy to communicate that one idea is more important than another in the same sentence. The main clause contains the more important idea, while the subordinate clause contains the less important idea. Different conjunctions and relative pronouns are used to join the clauses and indicate their relationship. Examples are provided to illustrate proper and faulty subordination. Faulty subordination occurs when the order of importance is reversed or the conjunction does not logically connect the clauses. Faulty sentences can be corrected by changing conjunctions or breaking sentences into multiple sentences.