Original: By the Greco-Roman era, many of them were healers, and were said to have many other special powers, including dream interpretation and the ability to control the weather, which they did by braiding or not combing their hair.
Simplified: By the Graeco-Roman era, many of them were healers, and were said to have many other powers, including explaining dreams and the power to control the weather by braiding or combing their hair.