Remove casings from sausage. Brown sausage, remove from pan, reserving drippings.
Cook celery, onion, and garlic in dripping until tender, about 5 minutes. Drain off fat. Add chicken broth, herbs, and crushed red pepper. Bring to a boil. Add pasta, return to a boil. Boil gently for 8-10 minutes until pasta is done.
Add cooked sausage and undrained tomatoes. Heat through. Stir in parsley.