Complex sentence: The legate secured Rufus'recognition of Urban, but refused to consider the deposition of Anselm, and at the king's court at Windsor, Rufus consented to Anselm receiving the pallium.
Split into simpler sentences: The legate secured Rufus'recognition of Urban, but afterwards refused to consider the deposition of Anselm. Rufus then dropped the idea of having Anselm deposed, and at the king's court at Windsor, Rufus consented to Anselm receiving the pallium.