Complex sentence: In 1802, under Napoleon, he became professor of mineralogy at the National Museum of Natural History and founder of the Musée de Minéralogie, but after 1814 he was deprived of his appointments by the Restoration government.
Split into simpler sentences: In 1802, under Napoleon, he became professor of mineralogy at the National Museum of Natural History and founder of the Musée de Minéralogie. After 1814 he was deprived of his appointments by the Restoration government.