Complex sentence: In 1983, a book of the same name was published by Natalie Zemon Davis, an American historian of early modern France who had served as a consultant and helped write the screenplay for the film.
Split into simpler sentences: In 1983, a book of the same name was published by Natalie Zemon Davis, an American historian of early modern France. She had served as a consultant and helped write the screenplay for the film.