Complex sentence: Britain had already passed an Irish Home Rule Act in 1914, suspended for the war's duration, and was to pass the Government of Ireland Act in late 1920, by which Ireland would have 2 home-ruled states within the British empire.
Split into simpler sentences: Britain had already passed an Irish Home Rule Act in 1914, suspended for the war's duration. Britain was to pass the Government of Ireland Act in late 1920, by which Ireland would have 2 home-ruled states within the British empire.