Complex sentence: Napoleon returns and for 100 days is again a threat; he is defeated at the Battle of Waterloo and exiled to a distant island; the Napoleonic Wars end, marking the start of the Britain's Imperial Century, 1815--1914.
Split into simpler sentences: Napoleon returns and for 100 days is again a threat; he is defeated at the Battle of Waterloo and exiled to a distant island. The Napoleonic Wars end, marking the start of the Britain's Imperial Century, 1815--1914.