Complex sentence: In 2011 "Consumer Reports" compared Proactiv with AcneFree and OXY Maximum; 83 subjects aged 14 to 40 used one of the products twice a day for eight weeks.
Split into simpler sentences: In 2011 "Consumer Reports" compared Proactiv with AcneFree and OXY Maximum. Eighty-three subjects, aged 14 to 40, used one of the products twice a day for eight weeks.