Complex sentence: In 1974 he started his academic career at the Norwegian School of Economics (NHH) as Associate professor in Management Information Systems, where he was promoted to professor in 1976, and served as rector from 1990 to 1996.
Split into simpler sentences: In 1974 he started his academic career at the Norwegian School of Economics (NHH) as Associate professor in Management Information Systems. Here he was promoted to professor in 1976, and served as rector from 1990 to 1996.