Tortellini Soup

Found this in tractor supply winter edition.

2 Tbsp. olive oil
1 onion, chopped
4 or 5 garlic cloves crushed
5 or 6 italian sausage (hot or mild, or sweet)
1 tsp. oregano
1 tsp.rosemary
1/2 tsp. basil
2 cans stewed tomatoes
6 cups chicken broth
1 bag (about 12 oz. fresh pre-washed
          spinach, chopped
1 package fresh or frozen tortellini
Parmesan cheese, to taste
salt and pepper, to taste