Complex sentence: The outer garment is belted at the sculpture's upper and lower waist and is approximately two inches shorter than the tunic, the skirts of which both fall towards the floor in a multitude of folds.
Split into simpler sentences: The outer garment is belted at the sculpture's upper and lower waist and is approximately two inches shorter than the tunic. The skirts of both the tunic and outer garment fall towards the floor in a multitude of folds.