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. In 1957, he was the chief conductor of the Netherlands Radio Philharmonic. He took the position of head conductor of the Netherlands Radio Philharmonic in 1957. He became chief conductor of the Netherlands Radio Philharmonic in 1957. He became chief conductor of the Netherlands Radio Philharmonic in 1957. He became the chief conductor of the Netherlands Radio Philharmonic in 1957. He became chief conductor of the Netherlands Radio Philharmonic in 1957. He became the Chief Conductor of the Netherlands Radio Philharmonic in 1957. He took the position of chief conductor of the Netherlands Radio Philharmonic in 1957.