The document discusses parallel structure, which is when elements in a sentence are alike in function and grammar form. An example is provided of modifying a complex sentence using parallel structure by adding "-ing" and conjunctions like "and." The document also provides examples of how to use parallel structure to simplify sentences and make them shorter. Instructions are given on how to create a slide boom presentation by signing up, uploading documents, modifying settings, and saving. A grammar handout further explains parallel structure and provides a fill-in-the-blank exercise.