Complex sentence: The West Derbyshire by-election for the British House of Commons took place on 23 November, 1967 and caused by the resignation of Conservative Member of Parliament (MP) Aidan Crawley.
Split into simpler sentences: The West Derbyshire by-election for the British House of Commons took place on 23 November, 1967. It was caused by the resignation of Conservative Member of Parliament (MP) Aidan Crawley.