Complex sentence: Ng Chung-sok sees that Ip had mastered a new style of Wing Chun from Leung Bik, which differs from Chan Wah-shun's orthodox style and have disagreements over how the art should be practised.
Split into simpler sentences: Ng Chung-sok sees that Ip had mastered a new style of Wing Chun from Leung Bik, which differs from Chan Wah-shun's orthodox style. Both of them start to have disagreements over how the art should be practised.