original: bernard haitink made his debut with the concertgebouw orchestra on 7 november 1956 .
simplifications: bernard haitink made his debut performance with the concertgebouw orchestra on 7 november 1956 . bernard haitink made his start with the concertgebouw orchestra on 7 november 1956 . bernard haitink made his debut with the concertgebouw orchestra on 7 november 1956 . bernard haitink made his first introduction with the concertgebouw orchestra on 7 november 1956 . bernard haitink first began with the concertgebouw orchestra on 7 november 1956 . bernard haitink made his debut with the concertgebouw orchestra on november 7 1956 . bernard haitink first appeared with the concertgebouw orchestra on 7 november 1956 . bernard haitink made his debut with the concertgebouw orchestra on november 7 , 1956 .