Complex sentence: Brigades, with a field not a regional administrative role, have usually been of a named type and numbered since the 19th century (e.g. Cavalry Brigade or Infantry Brigade), from after World War II brigade numbers have been unique and not by type.
Split into simpler sentences: Brigades, with a field not a regional administrative role, have usually been of a named type and numbered since the 19th century (e.g. Cavalry Brigade or Infantry Brigade). From after World War II brigade numbers have been unique and not by type.