Complex sentence: The subscapularis muscle origin is divided from the remainder of the rotator cuff origins as it is deep to the torn, leading to pain and restricted movement of the arm.
Split into simpler sentences: The subscapularis muscle origin is divided from the remainder of the rotator cuff origins as it is deep to the scapula. The tendons at the ends of the rotator cuff muscles can become torn, leading to pain and restricted movement of the arm.