Complex sentence: He was President of the District Congress Committee from 1953 to 1957; general secretary of the K.P.C.C. from 1963 to 1967; before serving as its treasurer from 1967 to 1972.
Split into simpler sentences: He was President of the District Congress Committee from 1953 to 1957. General Secretary of the K.P.C.C. from 1963 to 1967 and Treasurer of the K.P.C.C. from 1967 to 1972.