Complex sentence: He was President of the UCR youth wing in Catamarca Province (1981-83), and represented his province on the UCR national committee, in 1990-96 and 2001-04, and was vice-president and treasurer of the party.
Split into simpler sentences: He was President of the UCR youth wing in Catamarca Province 1981-83. He represented his province on the UCR national committee 1990-96 and 2001-04, and was vice-president and treasurer of the party.