Complex sentence: "Blue", unless qualified, usually means the same blue as in a Blue Ensign, however, whatever the establishing resolution called for, many copies were made that were at variance with it, as variants often show a pale blue or Imperial blue field.
Split into simpler sentences: Blue, unless qualified, usually means the same blue as in a Blue Ensign. However, whatever the establishing resolution called for, many copies were made that were at variance with it, as variants often show a pale blue or Imperial blue field.