Complex sentence: Henry William "Harry" Mallin (June 1,1892--November 8,1969) was a British middleweight amateur boxer who was British Champion five years in a row from 1919 to 1923.
Split into simpler sentences: Henry William "Harry" Mallin (June 1,1892--November 8,1969) was a British middleweight amateur boxer. Mallin was British Champion five years in a row from 1919 to 1923.