Complex sentence: The West Hill Community Association is active in the West Hill area of Brighton, is based in West Hill Hall in Compton Avenue and, since the 1970s, produces a community magazine 6 times a year called "The Whistler".
Split into simpler sentences: The West Hill Community Association is active in the West Hill area of Brighton and is based in West Hill Hall in Compton Avenue. Since the 1970s, it produces a community magazine 6 times a year called "The Whistler".