Complex sentence: Hildegard was a multi-talented but fully grounded--a highly intelligent woman who was forced to hide her light; the modern world's first female rebel who re-transmitted her visions to the world for the greater glory of God and mankind.
Split into simpler sentences: Hildegard was a multi-talented, fully grounded, highly intelligent woman who was forced to hide her light. The modern world's first female rebel who re-transmitted her visions to the world for the greater glory of God and mankind.