Complex sentence: He served as "Treasury Devil" or Junior Counsel to the Ministry of Labour between 1967--68, and as First Junior Treasury Counsel (Common Law) from 1968 to 1974.
Split into simpler sentences: He served as Junior Counsel to the Ministry of Labour between 1967 and 1968. He was the First Junior Treasury Counsel (Common Law), or "Treasury Devil", from 1968 to 1974.