Complex sentence: The teenage Sultans were "guided" by regencies formed by the Valide Sultan, the Grand Vizier and the Valide's other supporters-and the Kizlar Agha was the Valide Sultan's and Kadin's intimate and value accomplice.
Split into simpler sentences: The teenage Sultans were "guided" by regencies formed by the Valide Sultan, the Grand Vizier and the Valides other supporters. The Kizlar Agha was the Valide Sultan's and the Kadin's intimate and value accomplice.