Complex sentence: Wilkes stood in London but came bottom of the poll of seven candidates, possibly due to his late entry into the race for the position, but he was quickly elected MP for Middlesex where most of his support was located.
Split into simpler sentences: Wilkes stood in London but came bottom of the poll of seven candidates possibly due to his late entry into the race for the position. But he was quickly elected MP for Middlesex where most of his support was located.