Complex sentence: At the end of the second and third rounds, de Randamie continued to throw punches after the horn had sounded and the referee stepped in, the first of which was a right hand that visibly wobbled Holm, who had already stopped fighting.
Split into simpler sentences: At the end of the second and third rounds, de Randamie continued to throw punches after the horn had sounded. The first of the punches which was a right hand that visibly wobbled Holm, who had already stopped fighting.