Complex sentence: They told Wingate that the main goal of the Wafd was the immediate termination of the British occupation of Egypt but not of their intention to use the Paris Peace conference to plead their case to the world powers.
Split into simpler sentences: They told Wingate that the main goal of the Wafd was the immediate termination of the British occupation of Egypt. This was what was originally told to the governor but he was not informed of their intention to use the Paris Peace conference to plead their case to the world powers.