Complex sentence: Phil and Lil are good friends of Tommy, Chuckie and Dil, but Phil was Tommy's adorable best friend and still has gross tendencies, although Lil has matured and picked up interests in fashion and boys.
Split into simpler sentences: Phil and Lil are good friends of Tommy, Chuckie and Dil. Phil still has gross tendencies, although Lil has matured and picked up interests in fashion and boys.