Complex sentence: Deng Xiaoping, the leader who along with Chen Yun introduced the Chinese economic reforms, was inspired by this concept, and he (and the Communist Party of China) still believes to this day that the state needs to control the economy's commanding heights.
Split into simpler sentences: Deng Xiaoping, the leader who along with Chen Yun introduced the Chinese economic reforms, was inspired by this concept. The Communist Party of China still believes to this day that the state needs to control the economy's commanding heights.