Complex sentence: Always one to cause a little chaos, Ethan cursed his costumes with the embodiment of the Roman god Janos, the wearer of one of his custom-made costumes would temporarily assume the personality and knowledge of whatever their costume identity was.
Split into simpler sentences: Always one to cause a little chaos, Ethan cursed his costumes in the name of the Roman god Janus. The wearer of one of his custom-made costumes would temporarily assume the personality and knowledge of whatever their costume identity was.