Complex sentence: It is attached to the rear of the yoke with the help of two doubled ¾ inch wide nylon straps passing through plastic D-rings on the top rear of the sack and adjustable at the yoke end by the same type of green buckle used elsewhere.
Split into simpler sentences: It is attached to the rear of the yoke with the help of two doubled ¾ inch wide nylon straps. These straps passed through plastic D-rings on the top rear edge of the sack and were adjustable at the yoke end by the same type of green buckle used elsewhere.