Complex sentence: He became a major in the quartermaster's department in 1806 and in 1812, he was appointed assistant quartermaster general serving in Spain and Portugal during the Napoleonic Wars and was also at the Battle of Waterloo and the capture of Paris.
Split into simpler sentences: He became a major in the quartermaster's department in 1806 and in 1812, he was appointed assistant quartermaster general serving in Spain and Portugal during the Napoleonic Wars. Dickson was also at the Battle of Waterloo and the capture of Paris.