Original sentence: Mendelssohn was deluged by offers of music from rising composers and would-be composers; amongst these was Richard Wagner who submitted his early Symphony, which, (to Wagner’s disgust) Mendelssohn lost or mislaid
Edited sentence: Mendelssohn was deluged by offers of music from rising composers and would-be composers; amongst these was Richard Wagner who submitted his early Symphony, which (to Wagner’s disgust) Mendelssohn lost or mislaid