Complex sentence: While Fiona was unable to return, Saki was saved by her Arcana, Bhanri (Lightning), who resembles a woman trapped in a giant crystal and was once a queen revered as the Goddess of War.
Split into simpler sentences: While Fiona was unable to return, Saki was saved by her Arcana, Bhanri, the Arcana of Lightning. She resembles a woman trapped in a giant crystal and was once a queen revered as the Goddess of War.