Complex sentence: In 1971, Li Jinhua became an accountant at aircraft factory number 572 in Shaanxi, where he worked for the next 14 years, rising to become the factory's director.
Split into simpler sentences: In 1971, Li Jinhua became an accountant for the aircraft factory number 572 in Shaanxi. He worked there for the next 14 years, and rose to become the factory's director.