Complex sentence: Charles Bradford Sheppard was an American working as a radio engineer for Hazeltine Electronics during World War II. Sheppard, who, worked on radar in the design office, asked Soviet intelligence to arrange Soviet citizenship for himself and his family.
Split into simpler sentences: Charles Bradford Sheppard was an American who during World War II worked as a radio engineer for Hazeltine Electronics. Shappard worked on radar in the design office and asked the Soviet intellignece to arrange Soviet citizenship for himself and his family.