Italian Chicken Stew

2 tablespoons olive oil 2 stalks celery , rough chop 2 carrots , rough chop 1 medium onion , rough chop 4 garlic cloves , chopped salt and pepper 1 (14 ounce)[...]

4 chicken breast halves , boneless &,skinless 2 (15 ounce) cans Italian-style diced tomatoes , undrained 1 cup onion , chopped 1 cup carrot , peeled[...]