Cloud City 4-16 is the sixteenth level of Cloud City. To pass this level with three stars, you should pop all pigs and score at least 81,000 points.
Send Chewie to the central part of the first steam. He will be pulled to cut the chain of two swings. With a bit of luck, it can cause to destroy the rightmost structure, too. If necessary, use Leia to clear the remaining pig.