Complex sentence: He searched and found his Father in another warren/time who he failed to return to his world, however did find a replacement demonfor a false figurehead for the Liosan people, Greyfrog, who was born of Mirepool's Clutch in the Twentieth Season of Darkness.
Split into simpler sentences: He searched and found his Father in another warren/time who he failed to return to his world, however did find a replacement demonfor a false figurehead for the Liosan people, Greyfrog. He was born of Mirepool's Clutch in the Twentieth Season of Darkness.