In a frying pan, add olive oil, and brown the chicken sausage over medium high heat. It isn't necessary to cook it all the way.
Add the chicken sausage, tomato puree, tomatoes, and spices to a crock pot. Cook over low heat for 2 hours, or high heat for 1 hour.
Add onion, bell peppers, and olives, and continue cooking for another 1½ hours on low, or 45 minutes on high heat.
Preheat oven to 425 degree f. Slice spaghetti squash in half. Clean out the seeds and pulp.
In a baking dish, put squash face down, and add ¼ inch of water. Cover tightly with foil, and bake for 1 hour and 20 minutes, or until tender and easily pulls out of the shell.