Complex sentence: The seat was created under the Redistribution of Seats Act 1885, which led to a net addition of 18 seats but the main purpose of which was to achieve a major reallocation by correcting over-representation of minor, often still old boroughs and depopulated county divisions.
Split into simpler sentences: The seat was created under the Redistribution of Seats Act 1885. This Act added a net 18 seats, but its main purpose was to correct the over-representation of minor, often still old boroughs and depopulated county divisions.