Simplify the following text for a Grade 5 native English-speaking person.
Original: While with the Buzz , Bowie also joined the Riot Squad ; their recordings , which included a Bowie number and Velvet Underground material , went unreleased . Ken Pitt , introduced by Horton , took over as Bowie 's manager .
Simplified: He took the name Bowie from Jim Bowie , who invented the Bowie knife .