Complex sentence: After serving as a doctor in the Austro-Prussian War, he became an assistant to Richard von Volkmann (1830-1889) at Halle, and during the Franco-Prussian War was head of a "Feldlazaretts".
Split into simpler sentences: After serving as a doctor in the Austro-Prussian War, he became an assistant to Richard von Volkmann (1830-1889) at Halle. During the Franco-Prussian War, he was in charge of a "Feldlazaretts".