Complex sentence: After the unification of China, with all other schools of thought banned, legalism became the endorsed ideology of the Qin dynasty, which was basically a system that required the people to follow the laws or be punished accordingly.
Split into simpler sentences: After the unification of China, with all other schools of thought banned, legalism became the endorsed ideology of the Qin dynasty. Legalism was basically a system that required the people to follow the laws or be punished accordingly.