Complex sentence: In March 1917 they were re-roled as infantry and together with the Welsh Horse were converted into the 25th (Montgomery and Welsh Horse Yeomanry) Battalion, Royal Welsh Fusiliers, they joined 231st Brigade in the 74th (Yeomanry) Division.
Split into simpler sentences: In March 1917 they were re-roled as infantry and together with the Welsh Horse were converted into the 25th (Montgomery and Welsh Horse Yeomanry) Battalion, Royal Welsh Fusiliers. They joined 231st Brigade in the 74th (Yeomanry) Division.