Complex sentence: Over his long career, Redouté painted the gardens at the Petite Trianon of Marie Antoinette as her official court artist and, during the revolution and Reign of Terror, he was appointed to document gardens which became national property.
Split into simpler sentences: Over his long career, Redouté painted the gardens at the Petite Trianon of Marie Antoinette as her official court artist. During the revolution and Reign of Terror, he was appointed to document gardens which became national property.