Complex sentence: He is one of the few powerful creatures of magic in the valley, along with Nightshade, although in "Tangle Box" and "Witches' Brew" he has proved to be not as evil as Nightshade.
Split into simpler sentences: He is one of the few powerful creatures of magic in the valley, along with Nightshade. Although in "Tangle Box" and "Witches' Brew" he has proved to be not as evil as Nightshade.