Complex sentence: Hermann Probst was a private scholar and Sanskrit researcher, fostered contacts with artists who were deemed by the Nazis to be "decadent", and married, after his first marriage broke up, Christoph Probst's mother, who was Jewish.
Split into simpler sentences: Hermann Probst was a private scholar and Sanskrit researcher, fostered contacts with artists who were deemed by the Nazis to be "decadent". After his first marriage broke up, he married Christoph's mother, who was Jewish.