Simplify the following text for a Grade 13 native English-speaking person.
Original: Over the years the Jazz Messengers served as a springboard for young jazz musicians such as Donald Byrd , Johnny Griffin , Lee Morgan , Wayne Shorter , Freddie Hubbard , Keith Jarrett , Chuck Mangione , Woody Shaw , Joanne Brackeen and Wynton Marsalis .
Simplified: Over the years the Jazz Messengers included jazz musicians such as Donald Byrd , Johnny Griffin , Lee Morgan , Wayne Shorter , Freddie Hubbard , Keith Jarrett , Chuck Mangione , Woody Shaw , JoAnne Brackeen and Wynton Marsalis .