You have to tell us which words are underlined, but I have a feeling the words were "a popular author of children's books." which is an appositive. Author is the same thing as Shel Silverstein.
1. Black face, wide-eyed, and big-lips "happy harpies" (White actors dressed like African American ppl)
2. Sly, shuffling, mammies
3. Pickaninnies (bare-footed, black kids, braided hair)
4. Watermelon eating ( portrayed as lazy with no common sense)
Where are the words at to pick from ?