Complex sentence: Super Eric then climbed to the top of the cage to perform a splash on all of his opponents who were standing together in a group, after which he handcuffed all of the remaining participants to win with Kaz the future championship match.
Split into simpler sentences: Super Eric then climbed to the top of the cage to perform a splash on all of his opponents, who were standing together in a group. Afterwards, he stood up and handcuffed all of the remaining participants to win Kaz and himself the future championship match.