Complex sentence: Al Goddard (Alan Ladd), a U.S. Postal Inspector of the United States Postal Inspection Service, is assigned to locate and arrest two men who've allegedly murdered another U.S. Postal Inspector.
Split into simpler sentences: Al Goddard (Alan Ladd) is a U.S. Postal Inspector of the United States Postal Inspection Service. He is assigned to locate and arrest two men who have allegedly murdered a U.S. Postal Inspector.