Complex sentence: Gnostics structured their world of transcendent being by ontological distinctions whereby the plenitude of the divine world emerges from a sole high deity by emanation, radiation, unfolding and mental self-reflection.
Split into simpler sentences: Gnostics structured their world of transcendent being by ontological distinctions. The plenitude of the divine world emerges from a sole high deity by emanation, radiation, unfolding and mental self-reflection.