Preheat oven to 350° F. In a 13x9x2-inch baking pan, spread 1 cup of the sauce; arrange a layer of uncooked lasagna; top with 1 1/3 cup sauce, ½ of the Ricotta, 1/3 of the Mozzarella, and 1/3 of the Parmesan cheese. Repeat, gently pressing lasagna pieces into cheese mixture below. End with a final layer of lasagna; pour remaining sauce over, making sure all lasagna pieces are totally covered with sauce; top with remaining Mozzarella and Parmesan cheese. Bake 45 to 55 minutes until lightly browned and bubbling. Allow to stand 15 minutes; cut into squares to serve.