Complex sentence: William Crump (8 April 1865--14 January 1942), better known by the stage name Harry Champion, was a British music hall composer, singer and Cockney comedian, whose onstage persona appealed chiefly to the working class communities of East London.
Split into simpler sentences: William Crump (8 April 1865--14 January 1942), better known by the stage name Harry Champion, was a British music hall composer and singer. He was a noted Cockney comedian, whose adopted onstage persona appealed chiefly to the working class communities of East London.