Complex sentence: Chuck Murray (Bud Abbott) and Ferdie Jones (Lou Costello) work at a gas station, but long to move up to waiting tables at "Chez Glamour", a high-class nightclub.
Split into simpler sentences: Chuck Murray (Bud Abbott) and Ferdie Jones (Lou Costello) work at a gas station. However, they long to improve their lives by moving up to waiting tables at "Chez Glamour", a high-class nightclub.