Complex sentence: Weniger studied history of art, history and archaeology at the Hamburg University and gained his doctorate with a thesis: Wiederaufbau-und Neubauplanung in Hamburg 1945 bis 1950.
Split into simpler sentences: Weniger studied history of art, history and archaeology at the Hamburg University and gained his doctorate. Name of the thesis: Wiederaufbau-und Neubauplanung in Hamburg 1945 bis 1950.