Complex sentence: Nissanka Wijeyeratne was a long standing a member of the United National Party, and chief organizer for the Dedigama electorate, which he won in the 1977 Parliamentary Elections.
Split into simpler sentences: Nissanka Wijeyeratne was a long standing a member of the United National Party. He was then appointed as chief organizer for the Dedigama electorate, which he won in the 1977 parliamentary elections.