Complex sentence: Hayes has always been heavily involved with industry, both local and international, and is (or has been) the home of EMI, Nestlé, H. J. Heinz Company, and past companies include Fairey Aviation (later merged with Westland), and HMV.
Split into simpler sentences: Hayes has always been heavily involved with industry, both local and international, and is (or has been) the home of EMI, Nestlé and H. J. Heinz Company. Past companies include Fairey Aviation (later merged with Westland), and HMV.