Complex sentence: The United Kingdom general election, 1801 was not an election as such, but the co-option of members to serve in the first Parliament to be held after the formation of the United Kingdom of Great Britain and Ireland on 1 January 1801.
Split into simpler sentences: The United Kingdom general election, 1801 was not an election as such, but the co-option of members to serve in the 1st Parliament of the United Kingdom. It was the first Parliament to be held after the formation of the United Kingdom of Great Britain and Ireland on 1 January 1801.