Complex sentence: In response to the Notre Dame letter, University of Chicago psychology professor Leslie Kay started the website "Free Academics", which lists the names of professors across the United States who want their names to be added to the list.
Split into simpler sentences: In response to the Notre Dame letter, University of Chicago psychology professor Leslie Kay started the website "Free Academics". This website lists the names of professors across the United States who have signed it to ask for their names to be added to the list.