Complex sentence: The Arab Bureau was created by the British as a section of the Cairo Intelligence Department during the World War I. The bureau was created on the initiative of Mark Sykes and it was meant to make British decision making with regard to Arab affairs more unified and effective.
Split into simpler sentences: The Arab Bureau was created by the British as a section of the Cairo Intelligence Department during the World War I. The bureau was created on the initiative of Mark Sykes. Its purpose was to improve British decision making with regard to Arab affairs more unified and effective.