Complex sentence: He was a military leader who fought in the Napoleonic Wars and achieved the rank of Lieutenant General; and is noted in present-day Serbia, where he led a combined Russian and Serb army to defeat the Turks at Varvarin in 1810.
Split into simpler sentences: He was a military leader who fought in the Napoleonic Wars and achieved the rank of Lieutenant General. He is noted in present-day Serbia, where he led a combined Russian and Serb army to defeat the Turks at Varvarin in 1810.