Complex sentence: Johnny Marzetti is a baked pasta dish, or casserole, consisting of noodles, tomato sauce, cheese and ground beef, with additional shredded cheese typically added to the top before baking.
Split into simpler sentences: Johnny Marzetti is a baked pasta dish, or casserole, consisting of noodles, tomato sauce, cheese and ground beef. Shredded cheese is typically added to the top before baking.