Task: Explanation
Input (English): The City of Chester is a constituency created in 1545 (turned into a county division in 1885 and reformed in narrowed geographical guise in 1918) and represented in the House of Commons of the UK Parliament since 2015 by Chris Matheson of the Labour Party. Question: When was the constituency which its by-election was on15 November 1956 created  Answer: 1545
Output (English): The City of Chester is a constituency created in 1545 turned into a county division in 1885 and reformed in narrowed geographical guise in 1918 and represented in the House of Commons of the UK Parliament since 2015 by Chris Matheson of the Labour Party.