Words, phrases, clauses, and whole series of sentences within paragraphs can be parallel. In much current business and technical writing, you'll see parallel lists of points indented and bulleted, while rhetoricians from Lincoln to Martin Luther King used parallel constructions to create emotional suspense in their speeches.
Democracy demands responsibility, whereas tyranny demands obedience.
The 1981 inaugural celebration was well organized, with large public celebrations, elaborate private parties, and intimate gatherings. Vito likes novels and short stories, but Jessie prefers newspapers and biographies. All her employers found Maria to be intelligent, able, and hard working. To have dreams is important, but to live them is even more important. Because Ira memorizes, acts, and sings well, he is a musical director's ideal performer.