Complex sentence: In 1950, Lafargue resigned as U.S. attorney to challenge in the Democratic primary election U.S. Senator Russell B. Long, son of Huey Pierce Long, Jr., and nephew of Earl Long, who successfully sought the first of six consecutive six-year terms in office.
Split into simpler sentences: In 1950, Lafargue resigned as U.S. attorney to challenge in the Democratic primary election U.S. Senator Russell B. Long, son of Huey Pierce Long, Jr., and nephew of Earl Long. Russell Long successfully sought the first of six consecutive six-year terms in office.