Complex sentence: In 1985, Sheraton became the first western company to operate a hotel in the People's Republic of China, assuming management of the state-built Great Wall Hotel in Beijing, which became the Great Wall Sheraton.
Split into simpler sentences: In 1985, Sheraton became the first western company to operate a hotel in the People's Republic of China. It assumed management of the state-built Great Wall Hotel in Beijing, which became the Great Wall Sheraton.