Complex sentence: When his mother married a Polish-Jewish printworker, Ronald Davis, the family moved to London, where they lived initially in a flat in a "slum" in Wandsworth before moving to a council estate in Tooting, London.
Split into simpler sentences: When his mother married a Polish-Jewish printworker, Ronald Davis, he moved to London. They lived initially in a flat in a "slum" in Wandsworth before moving to a council estate in Tooting, London.