Complex sentence: Freethought Festival is a student-run freethinking convention held annually in Madison, Wisconsin by the student group Atheists, Humanists, and Agnostics at the University of Wisconsin-Madison.
Split into simpler sentences: Freethought Festival is a student-run freethinking convention held in the United States. It is hosted annually in Madison, Wisconsin by the student group Atheists, Humanists, and Agnostics at the University of Wisconsin-Madison.