Complex sentence: He was Dean of the School of Engineering and Applied Science at Columbia University from 1950 to 1969, and served on the board of trustees of Science Service, now known as Society for Science & the Public, from 1958 to 1964.
Split into simpler sentences: He was Dean of the School of Engineering and Applied Science at Columbia University from 1950 to 1969. He also served on the board of trustees of Science Service, now known as Society for Science & the Public, from 1958 to 1964.