Complex sentence: In their room, the couple hear loud and insistent banging occurs on their door and from the door to the adjacent room and receive anonymous phone calls, despite being told by Mason they are the only people staying there.
Split into simpler sentences: In their room, the couple hear loud and insistent banging on their door and on the door to the adjacent room. They also receive anonymous phone calls, despite being told by Mason they are the only people staying there.