Complex sentence: The 2/1st Lancashire Hussars was formed September 1914, and remained in United Kingdom until May 1918, when moved to Ireland, having first converted into a cyclist unit in July 1916.
Split into simpler sentences: The 2/1st Lancashire Hussars was formed September 1914. It remained in the United Kingdom until May 1918, when it moved to Ireland, having first converted into a cyclist unit in July 1916.