Simplify the following text for a Grade 9 native English-speaking person.
Original: Jack William Nicklaus ( born January 21 , 1940 in Columbus , Ohio ) is a American golfer who is known for winning the most victories in major championships with 18 wins .
Simplified: Jack William Nicklaus ( born January 21 , 1940 ) , also known as `` The Golden Bear '' , is an American professional golfer .