Complex sentence: Following the formation of the Canadian federation in 1867, a proper military was formed for the new country, though it remained a subset of the British Army, ultimately taking their orders from the King of the United Kingdom on the advice of his British Cabinet.
Split into simpler sentences: Following the formation of the Canadian federation in 1867 a proper military was formed for the new country. Though the monarch was Commander-in-Chief through the Canadian constitution, the Canadian militia remained a subset of the British Army, ultimately taking their orders from the King of the United Kingdom on the advice of his British Cabinet.