Complex sentence: Thus, practitioners began to research Chin Na in order to make comparisons, rhe recent popularity of grappling has also caused some Kung Fu systems to focus heavily on their Chin Na techniques, even expanding the system by incorporating/developing new ones.
Split into simpler sentences: Thus, practitioners began to research Chin Na in order to make comparisons. The recent popularity of grappling has also caused Kung Fu systems to focus heavily on their Chin Na techniques, even expanding the system by incorporating/developing new ones.