Complex sentence: Be'lakor, watching from the heavens, screamed in fury as the chosen conqueror again fell in combat for he knew that if the Dark Gods had not cursed him, with his full might he would have proved victorious.
Split into simpler sentences: Be'lakor, watching from the heavens, screamed in fury as the chosen conqueror again fell in combat. He knew that if the Dark Gods had not cursed him, he would have proved victorious.