Simplify the following text for a Grade 9 native English-speaking person.
Original: James Marshall `` Jimi '' Hendrix ( born Johnny Allen Hendrix , November 27 , 1942 â `` September 18 , 1970 ) was an American guitarist and singer-songwriter .
Simplified: James Marshall Hendrix ( November 27 , 1942 â `` September 18 , 1970 ) , was an American guitarist .