Complex sentence: On the merger of Daimler with other airlines to form Imperial Airways in April 1924, the new monopoly airline terminated the service: it was 1930 before Imperial again flew any schedules north of London.
Split into simpler sentences: On the merger of Daimler with other airlines to form Imperial Airways in April 1924, the new monopoly airline terminated the service. It was to be 1930 before Imperial again flew any schedules north of London.