Complex sentence: He vacated his seat in February 1775 to allow in his second cousin, James Worsley and was then returned unopposed as MP for Newtown (Isle of Wight) under Holmes control at a by-election on 4 December 1775.
Split into simpler sentences: He vacated his seat in February 1775 to allow in his second cousin, James Worsley. He was returned as an MP for Newtown (Isle of Wight) under Holmes control at a by-election on 4 December 1775.