Complex sentence: According to the tenets of Vodou, a dead person can be revived by a bokor, or sorcerer, in which form the victims remain under the control of the bokor having no will of their own.
Split into simpler sentences: According to the tenets of Vodou, a dead person can be revived by a bokor, or sorcerer. Zombies remain under the control of the bokor since they have no will of their own.