Complex sentence: While her finest work dates to the 1920s and'30s, including the book illustrations for which she developed a passion in the' 20s, she was active into the' 60s, winning a watercolor prize at the "Biennale de Deauville" in 1965.
Split into simpler sentences: While her finest work dates to the 1920s and'30s, including the book illustrations for which she developed a passion in the' 20s, she was active into the 1960s. She won a watercolor prize at the "Biennale de Deauville" in 1965.