Simplify the following text for a Grade 14 native English-speaking person.
Original: After Freddie Mercury 's death in November 1991 , remaining band members John Deacon , Roger Taylor and Brian May worked with vocals and piano parts that Mercury recorded before he died , along with newly recorded lyrics by the remaining band members .
Simplified: After Freddie Mercury 's death in 1991 , the remaining band members John Deacon , Roger Taylor and Brian May worked with vocals that Mercury had previously recorded , along with newly recorded lyrics by the remaining band members .