Complex sentence: After the death of his good friend and former employer, Cromwell, in 1931 Darnell moved his family to Denver, Colorado and he began working for United States Airways, Inc (USA Inc) making regular flights between Denver and Kansas City, Missouri.
Split into simpler sentences: After the death of his good friend and former employer, Cromwell, in 1931 Darnell moved his family to Denver, Colorado. He began working for United States Airways, Inc. (USA Inc.), making regular flights between Denver and Kansas City, Missouri.