Complex sentence: Situated north of the city centre of Chongqing, the airport is a major aviation hub for airlines in western China, including China Express Airlines, China Southern Airlines, Chongqing Airlines, Sichuan Airlines, and China West Air.
Split into simpler sentences: Situated north of the city centre of Chongqing, the airport is a major aviation hub for western China. It is a hub for China Express Airlines, China Southern Airlines, Chongqing Airlines, Sichuan Airlines, and China West Air.