Complex sentence: Flash uses the wormhole to escape and then engages Professor Zoom, where they run around the world doing battle, which ends up with Flash using his speed to glaze some sand to form a wall of glass, before tripping up Professor Zoom.
Split into simpler sentences: Flash uses the wormhole to escape and then engages Professor Zoom where they run around the world doing battle. The fight ends up with Flash using speed to glaze some sand to form a wall of glass before tripping up Professor Zoom.