Complex sentence: Set Abominae is an Anti-Christ-like figure, spoken of in the Prophecy, the savior of the Setian race set to bring about the end of mankind, who in ancient times came from another galaxy and conquered Earth.
Split into simpler sentences: Set Abominae is an Anti-Christ-like figure, spoken of in the Prophecy. He is the savior of the Setian race set to bring about the end of mankind, who in ancient times came from another galaxy and conquered Earth.