Cut onion, squash, zucchini, garlic, basil and sausage.
Pour tomatoes into large pot and add onion, squash, zucchini, garlic, basil, sausage, Italian seasoning and cinnamon.
Turn on medium-high heat, stirring frequently until hot (about 10 - 15 minutes). Reduce heat to low and simmer for 30 minutes up to a few hours.
Serve with pasta of choice.