Complex sentence: P.137 The Gottesmann Quartet performed Schoenberg's "Quartet Nr.1 d-moll op 7" on Feb.18,1921 at the Konzerthaus Mozart-Saal.
Split into simpler sentences: P.137 The Gottesmann Quartet performed Schoenberg's "Quartet Nr.1 D-Minor. Op 7" on Feb.18,1921 at the Konzerthaus Mozart-Saal.