Complex sentence: He has a girlfriend named Komaki Nakao (whom he calls "Meat ☆ Angel" because of her love of meat), whose father drove the car that struck and killed Kyoko Honda, also killing himself.
Split into simpler sentences: He has a girlfriend named Komaki Nakao (whom he calls "Meat ☆ Angel" because of her love of meat). Komaki's father drove the car that struck and killed Kyoko Honda, also killing himself.