Simplify the following text for a Grade 10 native English-speaking person.
Original: Gabrial `` Gabe '' McNair ( born September 8 , 1973 ) is a multi-instrumentalist and composer , most famous for his work in No Doubt since 1993 as a trombonist , keyboardist , and backing vocalist .
Simplified: Gabrial `` Gabe '' McNair ( born September 8 , 1973 ) is a multi-instrumentalist and composer .