Complex sentence: Captain Ahab is a fictional character, the protagonist in Herman Melville's "Moby-Dick" (1851), is the monomaniacal captain of the whaling ship "Pequod".
Split into simpler sentences: Captain Ahab is a fictional character, the monomaniacal protagonist in Herman Melville's "Moby-Dick" (1851). Ahab, the captain of the whaling ship "Pequod".