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