Complex sentence: In 1978, Heflin was elected to the United States Senate to succeed fellow Democrat John Sparkman, who had been Adlai E. Stevenson's running-mate in 1952, when slated against Richard Nixon, Dwight D. Eisenhower's running-mate, on the Republican ticket.
Split into simpler sentences: In 1978, Heflin was elected to the United States Senate to succeed fellow Democrat John Sparkman. He had been Adlai E. Stevenson's running-mate in 1952, when slated against Richard Nixon, Dwight D. Eisenhower's running-mate, on the Republican ticket.