Complex sentence: The 5th and 6th Battalions Royal Irish Fusiliers were subsequently amalgamated and continued service in the Meditteranean theatre until the cessation of hostilities in 1918.
Split into simpler sentences: The 5th and 6th Battalions Royal Irish Fusiliers were subsequently amalgamated and continued service in the Meditteranean theatre. \\ until the cessation of hostilities in 1918.