Complex sentence: A Darklord was originally a person (or monster) who committed a truly horrific crime, which drew the attention of the enigmatic Dark Powers who then proceeded to craft a personal kingdom around the Darklord.
Split into simpler sentences: A Darklord was originally a person (or monster) who had committed a truly horrific crime, which drew the attention of the enigmatic Dark Powers. The Dark Powers then proceeded to craft a personal kingdom around the Darklord.