This stage can be really tough if you are playing it incorrectly. Ideally you want to launch the Jedi bird into the center without falling on the left side, this way you can get some additional points.
However, for the three star rating, all you need to do is to launch into the left cliff and cut the upper rope. Then the center blocks would fall on each other and kill all the pigs.
Power Activation Point
This picture shoes power usage at the upper rope.
First Shot Result
All the pigs die and you will earn your three star rating if you use one shot only.