Complex sentence: It returned one Member of Parliament to the House of Commons of the Parliament of the United Kingdom from 1983 until it was abolished for the 1997 general election, when it was partly replaced by the new constituency of Rochford and Southend East.
Split into simpler sentences: It returned one Member of Parliament to the House of Commons of the Parliament of the United Kingdom from 1983 until it was abolished for the 1997 general election. It was partly replaced by the new constituency of Rochford and Southend East.