Complex sentence: From 1947 to 1949, he studied art history at the universities of Vienna and Paris, where he completed a Ph.D. dissertation on the "Graphische Gestaltungsweise von Honoré Daumier".
Split into simpler sentences: From 1947 to 1949, he studied art history at the universities of Vienna and Paris. He wrote a Ph.D, dissertation on the "Graphische Gestaltungsweise von Honoré Daumier".