Complex sentence: When French troops occupied the Duchy of Saxe-Coburg in 1806 during the Napoleonic Wars, Leopold went to Paris where he became part of the Imperial Court of Napoleon I. Napoleon offered him the position of adjutant, but Leopold refused.
Split into simpler sentences: When French troops occupied the Duchy of Saxe-Coburg in 1806 during the Napoleonic Wars, Leopold went to Paris. Emperor Napoleon I offered him the position of adjutant, but Leopold refused.