Complex sentence: When the first full box had been finished it was put in the hands of kings and emperors for 740 years, wars were started over the fabled box it remained un-open until the fateful day that the mythic box came into the hands of the Jesse Cox.
Split into simpler sentences: When the first full box had been finished it was put in the hands of kings and emperors for 740 years, wars were started over the fabled box. It remained un-open until the fateful day that the mythic box came into the hands of the Jesse Cox.