Complex sentence: It draws heavily upon Jones'World War II experiences of the Guadalcanal campaign at the Battle of Mount Austen, the Galloping Horse, and the Sea Horse, in which the author served in the United States Army's 25th Infantry Division 27th Infantry Regiment.
Split into simpler sentences: It draws heavily on Jones's experiences at the Battle of Mount Austen, the Galloping Horse, and the Sea Horse during World War II's Guadalcanal campaign. The author served in the United States Army's 25th Infantry Division, 27th Infantry Regiment.