Simplify the following text for a Grade 7 native English-speaking person.
Original: William Sanford `` Bill '' Nye ( born November 27 , 1955 ) , popularly known as `` Bill Nye the Science Guy '' , is an American science educator , comedian , television host and mechanical engineer .
Simplified: William Sanford Nye ( born November 27 , 1955 ) is an American engineer , scientist and educator . He is most known for hosting the TV show Bill Nye the Science Guy .