Complex sentence: The competition was based on the Midlands Counties Knockout Cup experiment of 1962, when Derbyshire, Leicestershire, Northamptonshire and Nottinghamshire played one-innings-a-side matches which each lasted one day.
Split into simpler sentences: The competition was based on the Midlands Counties Knockout Cup experiment of the 1962. Where Derbyshire, Leicestershire, Northamptonshire and Nottinghamshire played a one-innings-a-side which lasted one day.