Complex sentence: He grew up on a council estate of Islington, which has always made it easy for him to retain an "almost defiantly working-class in attitudes" said the British novelist and screenwriter Ray Connolly.
Split into simpler sentences: He grew up in a working-class council estate of Islington, which has always made it easy for him to relate to working-class people. Parker "remains almost defiantly working-class in attitudes," said British novelist and screenwriter Ray Connolly.