Simplify the following text for a Grade 7 native English-speaking person.
Original: John Denver ( December 31 , 1943 â `` October 12 , 1997 ) , born Henry John Deutschendorf , Jr. , was an American singer-songwriter , actor , activist , poet , photographer and avid pilot .
Simplified: John Denver ( born Henry John Deutschendorf , Jr. ) ( December 31 , 1943 â `` October 12 , 1997 ) , was an American musician and songwriter .