Complex sentence: However, for two days every year through trains were run from London, terminating at North Weald for the North Weald airshow, on the Saturday and Sunday of its opening at the aerodrome almost adjacent to the station.
Split into simpler sentences: However, for two days every year, through trains were run from London, terminating at North Weald. These trains served the North Weald airshow on the Saturday and Sunday of its opening at the aerodrome almost adjacent to the station.