Simplify the following text for a Grade 8 native English-speaking person.
Original: Peter Lewis Kingston Wentz III ( born on June 5 , 1979 ) better known as Pete Wentz , is an American musician , best known for being the bassist and primary lyricist for the American rock band Fall Out Boy .
Simplified: Peter Lewis Kingston Wentz III ( born June 5 , 1979 ) is an American musician and songwriter .