In a large pan and cook the Italian sausage, onion, and garlic, until the meat is browned and the onion is tender; drain well

In a 4 quart crockpot, combine sausage mixture, tomato sauce, and undrained tomatoes, tomato paste, oregano, basil, sugar, and red pepper.

Stir all the ingredients together then cover and cook on low heat setting 6 to 8 hours or on a high heat setting the 3 to 4 hours

Stir in olives.

Sprinkle with grated Parmesan cheese and serve with the desired dippers