Complex sentence: The S-42 named the "Pan Am Clipper" was used to survey the route from the US West Coast to China, making the first survey flight from Los Angeles, California to Pearl Harbour, Hawaii in April 1935.
Split into simpler sentences: The S-42 named the "Pan Am Clipper" was used to survey the route from the US West Coast to China. Making the first survey flight from Los Angeles, California to Pearl Harbour, Hawaii in April 1935.