Complex sentence: Unfortunately, the Omnitrix malfunctions again and transforms Ben's parents into Wildmutt and Heatblast, causing Gwen to realize that the evil Waybig is Azmuth, himself.
Split into simpler sentences: Unfortunately, the Omnitrix malfunctions again and transforms Ben's parents into Wildmutt and Heatblast. So Gwen to realize that the evil Way Big is Azmuth, himself.