Complex sentence: Following his success in the Shu campaign, Deng Ai became arrogant about his achievements and showed disregard for the Wei government's authority--a weakness which the Wei general Zhong Hui exploited and manipulated to great effect.
Split into simpler sentences: Following his success in the Shu campaign, Deng Ai became arrogant about his achievements and showed disregard for the Wei government's authority. The Wei general Zhong Hui exploited and manipulated Deng Ai's arrogance to great effect.