Complex sentence: On 25 April 1920 two members of the Royal Irish Constabulary were ambushed and killed near Upton and the Upton Train Ambush took place on 15 February 1921.
Split into simpler sentences: On 25 April 1920 two members of the Royal Irish Constabulary (RIC) were ambushed and killed near Upton. The Upton Train Ambush took place on 15 February 1921.