Complex sentence: In the final confrontation, Matsukaze used his ice abilities to trap Larva in an ice barrier so Reiha could fight Miyu; he later sacrificed himself to protect Reiha from Miyu's flame attack.
Split into simpler sentences: In the final confrontation, Matsukaze used his ice abilities to trap Larva in an ice barrier so Reiha could fight Miyu. He later sacrificed himself to protect Reiha from Miyu's flame attack.