Complex sentence: He continued his association with Schoenberg as a pianist for the composer's Society for Private Musical Performances in Vienna, and made a transcription for piano trio of Schoenberg's "Verklärte Nacht".
Split into simpler sentences: He continued his association with Schoenberg as a pianist for the composer's Society for Private Musical Performances in Vienna. He also made a transcription for piano trio of Schoenberg's "Verklärte Nacht".