Complex sentence: The term "Brodie" is often mis-used and in its correct term refers only to the original 1915 "Brodie's Steel Helmet, War Office Pattern", designed by Mr Brodie for the War Office.
Split into simpler sentences: The term "Brodie" is often mis-used. It is correctly only applied to the original 1915 "Brodie's Steel Helmet, War Office Pattern", designed by Mr Brodie for the War Office.