Complex sentence: The Royal Devon Yeomanry was a Yeomanry regiment of the British Army, formed in 1920, it participated in the World War II and now forms a squadron of the Royal Wessex Yeomanry.
Split into simpler sentences: The Royal Devon Yeomanry was a Yeomanry regiment of the British Army, formed in 1920. It participated in World War II and now forms a squadron of the Royal Wessex Yeomanry.