Complex sentence: Sadistic and merciless, Deathmask strayed from the ideals of the Saints, and made no distinction between enemy and innocent, and kept the souls of his victims as trophies in his temple, tormenting them by depriving of their eternal rest.
Split into simpler sentences: Sadistic and merciless by nature, Deathmask strayed from the ideals of the Saints and made no distinction between enemy and innocent. He kept the souls of his victims as trophies in his temple, tormenting them by depriving of their eternal rest.