Complex sentence: Robert Heriot Barclay (18 September 1786--8 May 1837) was a British naval officer who was engaged in the Napoleonic Wars, and its North American counterpart, the War of 1812.
Split into simpler sentences: Robert Heriot Barclay (18 September 1786--8 May 1837). He was a British naval officer who was engaged in the Napoleonic Wars, and its North American counterpart, the War of 1812.