Complex sentence: From 1955 to 1957 he taught at the Braunschweig University of Technology and from 1957 to 1963 at the University of Hamburg, where from 1961 to 1963 he was an adjunct professor.
Split into simpler sentences: From 1955 to 1957 he taught at the Braunschweig University of Technology. From 1957 to 1963 he taught at the University of Hamburg, where from 1961 to 1963 he was an adjunct professor.