Complex sentence: Mansur fled, but later was persuaded to return, although Fa'iq retained his power, and later deposed Mansur's "vizier" al-Barghashi, who was exiled to Gurgan.
Split into simpler sentences: Mansur fled, but later was persuaded to return, although Fa'iq retained his power. Some time later, Fa'iq deposed Mansur's "vizier" al-Barghashi, and had him exiled to Gurgan.