Original: Eduard Rosé, Arnold’s brother, had been a founding member of the ensemble playing the cello, but left after one season to get married and was replaced by Reinhold Hummer, who was in turn replaced by Friedrich Buxbaum; cellist Anton Walter joined in 1921, but later on Buxbaum rejoined.
Simplified: Eduard Rosé, Arnold’s brother, was the cellist at first, but left after one season he left to get married and was replaced by Reinhold Hummer.