Complex sentence: He had arrived in England on 18 October 1934 with his wife Ise and they lived at the Lawn Road Flats in flat 15 until March 1937, when they left for the USA.
Split into simpler sentences: He had arrived in England on 18 October 1934 with his wife Ise. They lived at the Lawn Road Flats in flat 15 until March 1937, when they left for the USA.