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.