Complex sentence: Napoleon visited in 1799 and again in 1803; in 1804 the château became a'domaine impérial'; and in 1807 he ordered that it be made habitable again.
Split into simpler sentences: Napoleon visited in 1799 and again in 1803. In 1804 the château became a'domaine impérial' and in 1807 he ordered it be made habitable again.