Complex sentence: He was killed in battle against the players, but was revived as Malistaire the Undying by Morganthe, players battle Malistaire in Xibalba, where he is subsequently he is hurled into the Spiral.
Split into simpler sentences: He was killed in battle against the players, but was revived as Malistaire the Undying by Morganthe. Players battle Malistaire in Xibalba, where he is subsequently he is hurled into the Spiral.