Complex sentence: Upon further discussion, Deshwitat explains that due to the fact his dark magic was overwhelmed by Kalutika's light magic, if he were to learn light magic, he would be on equal ground with the God.
Split into simpler sentences: Upon further discussion, Deshwitat explains that because he practices dark magic, it was overwhelmed by Kalutika's light magic. If Desh were to learn light magic, he might be on equal ground with the God.