Original sentence: Her illustration career flourished during the better part of what is considered as the "golden age of American Illustration"<ref name="Parks"> and like many illustrators of her time, her career slowed down with the onset of the Great Depression which marked the end of that period, although she continued to do magazine illustrations until at least 1935
Edited sentence: Her illustration career flourished during the better part of what is considered as the "golden age of American Illustration" and like many illustrators of her time, her career slowed down with the onset of the Great Depression which marked the end of that period, although she continued to do magazine illustrations until at least 1935