Complex sentence: All escaped except Quintana, an engineering student at the University of Santiago, Chile and photographer Rodrigo Rojas DeNegri, who were severely beaten by military personnel, and later soaked with gasoline and set afire.
Split into simpler sentences: All escaped except Quintana, an engineering student at the University of Santiago, Chile and photographer Rodrigo Rojas DeNegri. Both were severely beaten by military personnel, and later soaked with gasoline and set afire.