modify the paragraph to be simpler
In his writings, Griffith declared that the Act of Union of Great Britain and Ireland in 1800 was illegal and that, consequently, the Anglo-Irish dual monarchy that existed under Grattan's Parliament and the so-called " Constitution of 1782 " were still in effect.
Griffith said the Act of Union of Great Britain and Ireland in 1800 was illegal and that there should therefore be one government for Great Britain and another for Ireland.