Complex sentence: She is credited with helping to develop miniature tall bearded irises, which she appreciated for their potential as cut flowers--she termed them'table irises'--and provided the first description of the class.
Split into simpler sentences: She is credited with helping to develop a new class, the miniature tall bearded irises, which she appreciated for their potential as cut flowers. She termed them'table irises' and provided the first description of the class.