Complex sentence: From the late 19th century onwards, the were no service chiefs of either the Army and or Navy, senior commanders reported directly to the King in Council, and apart from a single Minister for Defence, no unified command structure existed.
Split into simpler sentences: From the late 19th century onwards, there were no service chiefs of the Army or Navy; senior commanders reported directly to the King in Council. Apart from a single Minister for Defence, no unified command structure existed.