Complex sentence: His father was Professor Johannes Sievers, an art and architectural historian with the German Foreign Office until his dismissal by the Nazi government in 1933, and author of the first four volumes of a monograph on neo-classical architect Karl Schinkel.
Split into simpler sentences: His father was Professor Johannes Sievers, an art and architectural historian with the German Foreign Office until his dismissal by the Nazi government in 1933. He was also the author of the first four volumes of a monograph on neo-classical architect Karl Schinkel.