Original: It consists of the red cross of Saint George (patron saint of England), edged in white, superimposed on the Cross of St Patrick (patron saint of Ireland), which are superimposed on the Saltire of Saint Andrew (patron saint of Scotland).
Simplified: It has the red cross of Saint George (patron saint of England), edged in white, on top of the Cross of Saint Patrick (patron saint of Ireland), which are on the Saltire of Saint Andrew (patron saint of Scotland).