Complex sentence: From 1943 to 1950 he was Professor of Microchemistry and Geochemistry at the Graz University of Technology, 1959-1973 Associate Professor of Analytical Chemistry and head of analytical institute in Vienna.
Split into simpler sentences: From 1943 to 1950 he was Professor of Microchemistry and Geochemistry at the Graz University of Technology. From 1959-1973, he was Associate Professor of Analytical Chemistry and head of the Analytical Institute in Vienna.