Complex sentence: After duelling for a short while, Sword Saint I knows that he will not be able to defeat Mou Ming if he shows up, and retreats to prepare for his duel with Hung Ba.
Split into simpler sentences: After duelling for a short while, Sword Saint I knows that he is unable to defeat Mou Ming if Mou Ming shows up. He retreats to prepare for his duel with Hung Ba.