Complex sentence: He later worked as an assistant to Julius von Sachs (1832-1897) at Würzburg, and in 1873 became a professor of pharmacology and botany at the University of Bonn.
Split into simpler sentences: He later worked as an assistant to Julius von Sachs (1832-1897) at Würzburg. In 1873 he became a professor of pharmacology and botany at the University of Bonn.