Add tomatoes, tomato sauce, chicken broth, garlic, onion, bell pepper, tomato paste, oregano, sugar, salt and pepper to a 6 qt slow cooker. Crush the tomatoes with a spoon.
Cover and cook on LOW for 7-8 hours.
Using an immersion blender, puree until a desired consistency is reached.
Add the cream and basil and mix well.
Serve with shredded Parmesan cheese and crusty bread.