Simplify the following text for a Grade 7 native English-speaking person.
Original: William Boyd Watterson II ( b. July 5 , 1958 ) , known as Bill Watterson , is an American cartoonist and the author of the influential and popular comic strip Calvin and Hobbes .
Simplified: William B. Watterson II ( born July 5 , 1958 ) is an American artist and cartoonist .