Simplify the following text for a Grade 9 native English-speaking person.
Original: Dizzy Gillespie and Charlie Parker were members of the band , and Davis was brought in on third trumpet for a couple of weeks because the regular player , Buddy Anderson , was out sick .
Simplified: Dizzy Gillespie and Charlie Parker were in the band , and Davis joined them as third trumpet player when trumpeter Buddy Anderson was out sick .