Complex sentence: The site will be redeveloped with a new larger-capacity National Olympic Stadium designed by architect Zaha Hadid, set to host the 2019 Rugby World Cup and 2020 Olympic and Paralympic Games.
Split into simpler sentences: The site will be redeveloped with a new larger-capacity National Olympic Stadium designed by architect Zaha Hadid. The new stadium is set to host the 2019 Rugby World Cup and 2020 Olympic and Paralympic Games.