Complex sentence: He was educated at Buckhurst Hill County High School and the London School of Economics, began his career as a teacher at Ilford County High School, 1972-4 and resigned when he became a councillor for the London Borough of Redbridge (1974-8).
Split into simpler sentences: He was educated at Buckhurst Hill County High School and the London School of Economics. He resigned when he bcame a councillor for the London Borough of Redbridge (1974-8).