Original: Jack "Manassa Mauler" Dempsey (June 24, 1895 - May 31, 1983) was an American boxer who held the world heavyweight title from 1919 to 1926.
Simplified: William Harrison "Jack" Dempsey (June 24, 1895 - May 31, 1983) was an American boxer who held the world heavyweight title between 1919 and 1926.