This document discusses complex sentences and the different types of clauses that can be used to form complex sentences. It defines coordination as linking two clauses of equal grammatical status, while subordination involves linking one main clause to a dependent clause. Dependent clauses can be finite, containing a finite verb, non-finite with a non-finite verb like a gerund or infinitive, or verbless. The document provides examples of complex sentences using different types of dependent clauses and examines the similarities and differences between coordination and subordination.