Simplify the following text for a Grade 7 native English-speaking person.
Original: He was the great-grandson of William Stevenson , brother of Vice President Adlai E. Stevenson , making him a second cousin once removed of presidential candidate Adlai E. Stevenson II .
Simplified: His grandfather Adlai E. Stevenson was Vice-president of the United States to Grover Cleveland , and his cousin Adlai E. Stevenson II was Governor of Illinois and unsuccessfully ran for President twice in the 1950s losing to Dwight D. Eisenhower both times .