Complex sentence: Dicey's opinion that any action of governance by the monarch beyond statute is under the prerogative diverges from Blackstone's that the prerogative simply covers those actions that no other person or body in the United Kingdom can undertake, such as the dissolution of Parliament.
Split into simpler sentences: Dicey's opinion is that any action of governance by the monarch beyond statute is under the prerogative. Blackstone, however, maintains that the prerogative simply covers those actions that no other person or body in the United Kingdom can undertake, such as the dissolution of Parliament.