Original sentence: Perfidious Albion is an anglophobic pejorative phrase used within the context of international relations and diplomacy to refer to alleged acts of diplomatic sleights, duplicity, treachery and hence infidelity (with respect to perceived promises made to or alliances formed with other nation states) by monarchs or governments of the UK (or England) in their pursuit of self-interest
Edited sentence: Perfidious Albion is an anglophobic pejorative phrase used within the context of international relations and diplomacy to refer to alleged acts of diplomatic sleights, duplicity, treachery and hence infidelity (with respect to perceived promises made to or alliances formed with other nation states) by monarchs or governments of the British Empire (or today the United Kingdom) in their pursuit of self-interest