Complex sentence: Centuries later, Ariadne returned from the dead when Circe transplanted her soul into the body of the Amazon sorceress Magala, who had died recently casting a spell and her passing had gone completely unnoticed by the other Amazons.
Split into simpler sentences: Centuries later, Ariadne returned from the dead when Circe transplanted her soul into the body of the Amazon sorceress Magala, who had died casting a spell. Magala's passing had gone completely unnoticed by the other Amazons.