Complex sentence: DC-2 number 32 "Kweilin" was owned by China National Aviation Corporation (CNAC), one of the first commercial airlines in China, it was operated under contract by Pan American pilots and management who were mostly American.
Split into simpler sentences: DC-2 number 32 "Kweilin" was owned by China National Aviation Corporation (CNAC), one of the first commercial airlines in China. It was operated under contract by Pan American pilots and management who were mostly American.