Complex sentence: Former guitarist Lu Edmonds, who had left the band by the time the album was recorded due to problems with tinnitus, received a writing co-credit on all tracks, although he does not play on the album.
Split into simpler sentences: Former guitarist Lu Edmonds left the band by the time the album was recorded due to problems with tinnitus. However, Edmunds received a writing co-credit on all tracks, although he does not play on the album.