Complex sentence: Finally captured, the gods decided on his punishment: for all eternity, he would have to push a rock up a mountain; upon reaching the top, the rock would roll down again leaving Sisyphus to start over.
Split into simpler sentences: Finally captured, the gods decided on his punishment for all eternity. He would have to push a rock up a mountain; upon reaching the top, the rock would roll down again, leaving Sisyphus to start over.