Complex sentence: In 1919, Tihanyi emigrated to Vienna after the fall of the brief Hungarian Democratic Republic; then to Berlin, where he became friends with Brassai and other Hungarian artists and writers.
Split into simpler sentences: In 1919, after the fall of the brief Hungarian Democratic Republic, Tihanyi emigrated to Vienna. He went on to Berlin, where he became friends with Brassai and other Hungarian artists and writers.