Complex sentence: Brewster's new store, which appeared the following year, was built and designed for the owner Sir George Gibbons by well known London architects Watt & Blackwell and by decade's end, Brewster had opened 11 stores in the chain.
Split into simpler sentences: Brewster's new store, which appeared the following year, was built and designed for the owner Sir George Gibbons by well known London architects Watt & Blackwell. By decade's end, Brewster had opened 11 stores in the chain.