Place sausage in a large pot. Cook over medium high heat until evenly brown. Add onion, celery and chopped garlic, and saute until tender and translucent. Stir in lentils, carrot, water, chicken broth and tomatoes. Season with garlic powder, parsley, bay leaves, oregano, thyme, basil, salt and pepper. Bring to a boil, then reduce heat. Cover, and simmer for 2 1/2 to 3 hours, or until lentils are tender.
Stir in pasta, and cook 15 to 20 minutes, or until pasta is tender.