A Massachusetts man was sentenced to up to two decades in prison in connection with possession of child sex abuse materials.Ryan Montpelier, a 39-year-old Montague resident, pleaded guilty Friday to three counts of indecent assault and battery on a child under 14, four counts of posing or exhibiting a child in a state of nudity, four counts of possession of CSAM, and one count of disseminating harmful material to minors. He was sentenced to 18 t…