Complex sentence: He was Professor of Medical Microbiology at the Goethe University Frankfurt from 1945, and then Professor Emeritus there until his death, and also worked with several developing countries in connection with medical development aid programmes of the West German government.
Split into simpler sentences: He was Professor of Medical Microbiology at the Goethe University Frankfurt from 1945, and then Professor Emeritus there until his death. From the late 1940s he also worked with several developing countries in connection with medical development aid programmes of the West German government.