Complex sentence: The formation of the 4th Infantry Division on November 17,1917, will be commemorated at its centennial anniversary it's a ceremony which is scheduled on November 17,2017 at the division's Fort Carson headquarters.
Split into simpler sentences: The formation of the 4th Infantry Division on November 17,1917, will be commemorated at its centennial anniversary. It's a ceremony which is scheduled on November 17,2017 at the division's Fort Carson headquarters.