Complex sentence: Its founding directors were H. Elsässer and G. Munch, who were followed by K.-H. Böhm, G. H. Herbig, and S. V. W. Beckwith.
Split into simpler sentences: Its founding directors were H. Elsässer and G. Munch. They where followed by K.-H. Böhm, G. H. Herbig, and S. V. W. Beckwith.