Complex sentence: At the mansion, Jackie talks with Johnny Powell, who tells him that the mystical object is the Siphon, an object created by the an entity called the Angelus, the sworn enemy and polar opposite of the Darkness.
Split into simpler sentences: At the mansion, Jackie talks with Johnny Powell, who tells him that the mystical object is the Siphon, an object created by the an entity called the Angelus. The Angelus is the sworn enemy and polar opposite of the Darkness.