Complex sentence: They have lived in Maida Vale, London, since the 1990s, and have four children, nine grandchildren and one great-grandchild; their eldest son is the prominent South African artist and filmmaker William Kentridge.
Split into simpler sentences: They have lived in Maida Vale, London, since the 1990s, and have four children, nine grandchildren and one great-grandchild. Kentridge's eldest son is the prominent South African artist and filmmaker William Kentridge.