Crockpot Kielbasa and Cabbage

1 lb. kielbasa sausage, sliced 1/4" thick
1 head cabbage, chopped
1 cup chopped onion
1 Tbsp. butter
28 oz. can tomatoes, undrained
4 cups chicken broth

Combine all ingredients in your crockpot. Cover and cook on
HIGH 4-6 hours or on LOW 8-10 hours.