Original: In 1919 cellist Friedrich Wilhelm Ludwig Grützmacher (1866-1919), the nephew of Friedrich Wilhelm Grützmacher, died, and Klengel recommended Feuermann for Grützmacher's position at the Gürzenich Conservatory in Cologne.
Simplified: Klengel was a good teacher for him In 1919 Friedrich Grützmacher died and Klengel recommended Feuermann should take his job at the Gürzenich Conservatory in Cologne.