Complex sentence: Mak, however, grabs Gin's gun and, in a fit of temporary insanity, she kills her father in revenge, before killing the rest of her family for allowing her plight to happen.
Split into simpler sentences: Mak, however, grabs Gin's gun and suffering a temporary insanity afterward. She brutally kills her father in revenge, before killing the rest of her family for allowing her plight to happen.