Complex sentence: In the arch-dualist ideology of the various Gnostic systems, the material universe is evil, while the non-material world is good; accordingly, the demiurge is malevolent, as linked to the material world.
Split into simpler sentences: In the arch-dualist ideology of the various Gnostic systems, the material universe is evil, while the non-material world is good. Accordingly, the demiurge is malevolent, as linked to the material world.