original: he took the post of chief conductor of the netherlands radio philharmonic in 1957 .
simplifications: he became the chief conductor of the netherlands radio philharmonic in 1957 . he became the chief conductor of the netherlands radio philharmonic in 1957 . he took the post of chief conductor of the netherlands radio philharmonic in 1957 . he took the post of chief conductor of the netherlands radio philharmonic in 1957 . bernard haitink , became chief conductor of the netherlands radio philharmonic in 1957 . in 1957 he became the chief conductor of the netherlands radio philharmonic . he took the post of chief conductor of the netherlands radio philharmonic in 1957 . he became chief conductor of the netherlands radio philharmonic in 1957 .