Complex sentence: The Avro York was, like its stablemates, the Lancaster and Lincoln, a very versatile aircraft; one York, LV633 "Ascalon", was custom-built as the personal transport of Prime Minister Winston Churchill.
Split into simpler sentences: The Avro York was, like its stablemates, the Lancaster and Lincoln, a very versatile aircraft. To illustrate the point, a special version, Avro York LV633 "Ascalon" was made for the personal transport of Prime Minister Winston Churchill.