Complex sentence: In 1854 he became professor of therapeutic pathology at the University of Würzburg, returning to the University of Vienna in 1872, where he succeeded Oppolzer as professor of special pathology and therapy.
Split into simpler sentences: In 1854 he became professor of therapeutic pathology at the University of Würzburg. In 1872 he returned to the University of Vienna, where he succeeded Oppolzer as professor of special pathology and therapy.