Complex sentence: From August 2007 she was Assistant Concertmaster of the Cologne Philharmonic Gürzenich Orchestra, and since September 2011 the First Concertmaster of the Trondheim Symfonieorkester.
Split into simpler sentences: From August 2007 Assistant Concertmaster of the Cologne Philharmonic Gürzenich Orchestra. Since September 2011 First Concertmaster of the Trondheim Symfonieorkester.