Complex sentence: In 1978 he came back for a year at CERN, from 1979 became professor at the Free University of Berlin and from 1980 to 1986 he taught at the Bergische Universität Wuppertal.
Split into simpler sentences: In 1978 he came back for a year at CERN. In 1979 he became professor at the Free University of Berlin and from 1980 to 1986 he taught at the Bergische Universität Wuppertal.