Complex sentence: The 23rd Brigade was the Philippine Scouts component of the division, consisting of the 45th and 57th Infantry Regiments, with a tactical responsibility for the defense of the Lingayen area on Luzon.
Split into simpler sentences: The 23rd Brigade was the Philippine Scouts component of the division, consisting of the 45th and 57th Infantry Regiments. It served tactical responsibility for the defense of the Lingayen area on Luzon.