This document defines and provides examples of different types of sentences: simple, compound, and complex. It explains that simple sentences contain one subject and one predicate, while compound sentences contain two or more independent clauses joined with coordinating conjunctions like "and," "but," and "or." Complex sentences contain one independent clause and one or more dependent clauses joined by subordinating conjunctions like "because," "when," and "although." The document provides guidance on punctuation for different sentence types, including using commas with coordinating conjunctions and conjunctive adverbs.