Complex sentence: Prior to the adoption of the current flag, the province could have unofficially used a Blue Ensign defaced with the provincial coat of arms, but there is no evidence that such a flag was ever sewn.
Split into simpler sentences: Prior to the adoption of the current flag, the province could have unofficially used a Blue Ensign defaced with the provincial coat of arms. However, there is no evidence that such a flag was ever sewn.