Complex sentence: The BBC reported that wealthy Conservative donors, including Michael Hintze, paid Werritty to act as an official political and strategic adviser to Fox, thus enabling him to bypass Whitehall officials and promote strongly pro-American policies and Euroscepticism in the UK and abroad.
Split into simpler sentences: The BBC reported that wealthy Conservative donors, including Michael Hintze, paid Werritty to act as a political and strategic adviser to Fox. This, it was argued, enabled him to bypass Whitehall officials and helped Fox promote strongly pro-American policies and Euroscepticism in the UK and abroad.