Complex sentence: On the parade square, the RSM, with his pace stick, is "king" as he has authority over all soldiers and even has the power to order punishment for subalterns (junior commissioned officers such as captains and lieutenants).
Split into simpler sentences: On the parade square, the RSM, with his pace stick, is "king". He has authority over all soldiers and even has the power to order punishment for subalterns (junior commissioned officers such as captains and lieutenants).