original: Bernard Haitink made his debut with the Concertgebouw Orchestra on 7 November 1956.
simplifications: Bernard Haitink's first professional show was the Concertgebouw Orchestra on 7 November 1956. Bernard Haitink first played in the Concertgebouw Orchestra on 7 November 1956. Bernard Haitink debuted with the Concertgebouw Orchestra in Nov 1956. Bernard Haitink debuted with the Concertgebouw Orchestra November 7th 1956. Bernard Haitink first played with the Concertgebouw Orchestra on 7 November 1956. Bernard Haitink debuted with the Concertgebouw Orchestra on 7 November 1956. Bernard Haitink first appeared with the Concertgebouw Orchestra on November 7, 1956. Bernard Haitink first played with the Concertgebouw Orchestra in 1956. Bernard Haitink debuted with the Concertgebouw Orchestra on November 7, 1956. Bernard Haitink started with the Concertgebouw Orchestra on November 7th, 1956,