Complex sentence: In 1923 he joined Instone Air Line covering Denmark, Germany, Holland, Belgium, London and Paris, and after the merger into Imperial Airways he flew a De Havilland Hercules to Cairo and opened up the Imperial Airways Eastern route.
Split into simpler sentences: In 1923 he joined Instone Air Line covering Danemark, Germany, Holland, Belgium, London and Paris. After joining Imperial Airways he flew a Hercules to Cairo and opened up the Imperial Airways Eastern route.