Complex sentence: Taking Captain Cold's weapon he freezes Dawnstar and Karate Kid and uses the Eternity Glass unleashing Time Trapper as his servant to travel to the point when he last fought the League.
Split into simpler sentences: Taking Captain Cold's weapon he freezes Dawnstar and Karate Kid. He then uses the Eternity Glass to unleash Time Trapper as his servant, allowing him to travel to the point when he last fought the League.