Complex sentence: At first it occupied premises at 38 Kensington Mansions, Trebovir Road, London SW5, and in October 1919 moved to 75 Cornwall Gardens, London SW7.
Split into simpler sentences: At first it occupied premises at 38 Kensington Mansions, Trebovir Road, London SW5. In October 1919 moved to 75 Cornwall Gardens, London SW7.