Complex sentence: The 2nd Battalion then arrived in Cape Colony in early February 1900 to take part in the Second Boer War and saw action at the Battle of Elands River in September 1901.
Split into simpler sentences: The 2nd Battalion then arrived in Cape Colony in early February 1900 to take part in the Second Boer War. The battalion saw action at the Battle of Elands River in September 1901.