Complex sentence: Yu Qiangsheng (born 1940) was a spy chief of the People's Republic of China whose defection to the United States in 1985 led to the arrest and suicide of Chinese spy Larry Wu-Tai Chin.
Split into simpler sentences: Yu Qiangsheng (born 1940) was a spy chief of the People's Republic of China who defected to the United States in 1985. The information he provided led to the arrest and suicide of Chinese spy Larry Wu-Tai Chin.