Complex sentence: After the incident, Sima Zhao publicly revealed Cao Mao's crimes, and removed the title of Emperor from Cao Mao, and ordered that anyone who supported Cao Mao must killed by Sima Zhao after Cao Mao died.
Split into simpler sentences: After the incident, Sima Zhao publicly announced Cao Mao's crimes, and removed the emperor's title from Cao Mao. The all of the people that support Cao Mao be killed by Sima Zhao after Cao Mao died.