Original sentence: In practice, most political power is exercised by the Parliament of the United Kingdom (of which the Sovereign is a component, together with the House of Lords and the House of Commons), and by the Prime Minister and Cabinet.The Sovereign is also the Supreme Governor of the established Church of England
Edited sentence: By constitutional convention, the Sovereign exercises the Royal Prerogative, with very few exceptions, solely on the advice of the Prime Minister and other ministers.In practice, most political power is exercised by the Parliament of the United Kingdom (of which the Sovereign is in theory a component, together with the House of Lords and the House of Commons), and by the Prime Minister and Cabinet.The Sovereign is also the nominal Supreme Governor of the established Church of England, but in practice the spiritual leadership of the Church is the responsibility of the Archbishop of Canterbury.Thus, as the modern British monarchy is a constitutional one, the Sovereign's role is limited to ceremonial and non-partisan functions