Complex sentence: Thog, along with Mephisto and Satannish, were alleged to be manifestations of Satan's evil and power, however he is autonomous from said beings with a unique appearance, personality and traits.
Split into simpler sentences: Thog, along with Mephisto and Satannish, were alleged to be manifestations of Satan's evil and power. However, he is autonomous from said beings with a unique appearance, personality and traits.