Complex sentence: During the 1875 uprisings in Bosnia and Herzegovina, he assumed control of the Turkish forces there; and on the outbreak of the Russo-Turkish War, 1877-1878, he was sent to take charge of operations in Erzurum.
Split into simpler sentences: During the 1875 uprisings in Bosnia and Herzegovina, he assumed control of the Turkish forces there. On the outbreak of the Russo-Turkish War, 1877-1878, he was sent to take charge of operations in Erzurum.