Simplify the following text for a Grade 12 native English-speaking person.
Original: Dolly Rebecca Parton ( born January 19 , 1946 ) is an American singer-songwriter , author , multi-instrumentalist , actress and philanthropist , best-known for her work in country music .
Simplified: Dolly Rebecca Parton ( born January 19 , 1946 ) is an American , Grammy Award-winning country music singer\/songwriter , composer , author , and actress .