Complex sentence: Her total output as a stained glass artist was small, just over 30 stained glass commissions, but her work is now viewed as being was as equally important as the leading stained glass artists at that time.
Split into simpler sentences: Her total output as a stained glass artist was small, just over 30 stained glass commissions. Hher work is now viewed as being was as equally important as the leading stained glass artists at that time.