Complex sentence: In 1920, its name was changed to "Niederdeutsche Bühne Hamburg e. V.", indicating The letters e.V. stand for Eingetragener Verein, which, under German law, can only be run by volunteers the company now had to rely on volunteers to stage any production.
Split into simpler sentences: In 1920, its name was changed to "Niederdeutsche Bühne Hamburg e. V.". Thus, the company now had to rely on volunteers to stage any production.