Complex sentence: During World War I Haymes went to France in command of the 6th Siege Battery (September 1914); took part in the First Battle of Ypres (October 2014) and the Battle of Neuve Chapelle (10 March 1915).
Split into simpler sentences: During World War I, Haymes went to France in command of the 6th Siege Battery (September 1914). He took part in the First Battle of Ypres (October 2014) and the Battle of Neuve Chapelle (10 March 1915).