Original sentence: At twenty-two, Waters was elected a fellow of the Society of Scribes and Illuminators.There she developed her calligraphic skills under the tutelage of Dorothy Mahoney (assistant to the calligrapher Edward Johnston)
Edited sentence: At twenty-two, Waters was elected a Fellow of the Society of Scribes and Illuminators.There she developed her calligraphic skills under the tutelage of Dorothy Mahoney (assistant to the great pioneer of calligraphy, Edward Johnston)