Complex sentence: A topping-out ceremony was held at the site of the last beam; at the ceremony, Gensler co-founder Art Gensler stated that the Shanghai Tower represents a new way of defining and creating cities.
Split into simpler sentences: A topping-out ceremony was held at the site of the last beam. During the ceremony, Gensler co-founder Art Gensler stated that the Shanghai Tower represents a new way of defining and creating cities.