Complex sentence: The Mall is the only center in the United States anchored exclusively by these five stores, and one of only two centers that features the five under one roof (Town Center at Boca Raton in Florida also contains a Sears).
Split into simpler sentences: The Mall is the only center in the United States anchored exclusively by these five stores. It is one of two centers that features the five under one roof (Town Center at Boca Raton in Florida also contains a Sears).