Complex sentence: Once a wizard and founder of the Unseen University, he attempted to gain immortality by reciting the Rite of AshKente backwards, which instead brought him to Death's Domain.
Split into simpler sentences: Once a wizard and founder of the Unseen University, he attempted to gain immortality by reciting the Rite of AshKente backwards. However, rather than bring Death to him, the rite instead brought him to Death's Domain.