Complex sentence: The Arundel and South Downs Conservative branch initially refused to seek a new candidate, though they reversed their position when threatened with the'Slough treatment', referring to the suspension of that association for refusing to deselect Adrian Hilton.
Split into simpler sentences: The Arundel and South Downs Conservative branch initially refused to seek a new candidate. Their minds were changed when they were threatened with the'Slough treatment', referring to the suspension of that association for refusing to deselect their candidate, Adrian Hilton.