Complex sentence: Italian explorer Vittorio Bottego reached the Omo river on 29 June 1896 during his his second African expedition (1895-97), dying during this expedition on 17 March 1897.
Split into simpler sentences: Italian explorer Vittorio Bottego reached Omo river on 29 June 1896 during his his second African expedition (1895-97). He died during this expedition on 17 March 1897.