Complex sentence: After Josephine's death, Redout,'s significant fortunes fell until appointed as a master of design for the Museum d'Histoire Naturelle in 1822 and awarded a Chevalier of the Legion d'Honneur in 1825.
Split into simpler sentences: After Josephine's death, Redouté's fortunes fell until he was appointed as a master of design for the Museum d'Histoire Naturelle in 1822. He was and awarded a Chevalier of the Legion d'Honneur in 1825.