Complex sentence: Since its creation, Topman has also built an international presence, including concession outlets in boutique stores in Chicago, New York, Japan, and two entire floors at the "world's largest fashion shop", in Oxford Circus, London.
Split into simpler sentences: Since its creation, Topman has also built an international presence, including concession outlets in boutique stores in Chicago, New York & Japan. As well as two entire floors at the "world's largest fashion shop", in Oxford Circus, London.