Simplify the following text for a Grade 9 native English-speaking person.
Original: Peter Warlock was a pseudonym of Philip Arnold Heseltine ( 30 October 1894 - 17 December 1930 ) , an Anglo-Welsh composer ( mainly of songs ) and music critic .
Simplified: Peter Warlock ( born London , 30 October 1894 ; died London , 17 December 1930 ) , was an English composer .