Complex sentence: Megamind is horrified at this change and attempts to convince Hal to be a "hero" by revealing how he has manipulated Hal who realizes he has been toyed with and battles Megamind.
Split into simpler sentences: Megamind is horrified at this change and attempts to convince Hal to be a "hero" by revealing how he has manipulated Hal. Hal realizes he has been toyed with and battles Megamind.