Complex sentence: The title originally referred to the chamberpot (or stool) of whomever the person served but later came to represent the long robe of the monarch (from the Latin "stola", meaning garment).
Split into simpler sentences: The title originally referred to the chamberpot (or stool) of whomever the person served. Later it came to represent the long robe of the Monarch (from the Latin "stola", meaning garment).