text: Herbert Clark Hoover ( August 10 , 1874 â `` October 20 , 1964 ) was the 31st President of the United States ( 1929 â `` 1933 ) .
simplified: Herbert Clark Hoover ( August 10 , 1874 â `` October 20 , 1964 ) , the 31st president of the United States from 1929 â `` 1933 .