Complex sentence: The avoirdupois weight system's general attributes were originally developed for the international wool trade in the Late Middle Ages era when trade was in recovery, and historically based on a physical standardized pound or "' prototype weight'" that could be partitioned into 16 ounces.
Split into simpler sentences: The avoirdupois weight system's general attributes were originally developed for the international wool trade in the Late Middle Ages, when trade was in recovery. It was historically based on a physical standardized pound or "' prototype weight'" that could be divided into 16 ounces.