Complex sentence: Yang's impulsive personality and lack of respect for other senior pugilists, compounded by the rebellious streak in him, made the situation worse and he leaves with Xiaolongnü after the quarrel.
Split into simpler sentences: Yang's impulsive personality and lack of respect for other senior pugilists, compounded by the rebellious streak in him, makes the situation worse. Consequently, he leaves with Xiaolongnü after the quarrel.