Complex sentence: During WW2, the Kriegsmarine used Ruhleben Barracks for submarine crew training; subsequently, they were renamed HMS Royal Alfred, from which the school's name evolved, and, then, Connaught Barracks by the British Army of the Rhine.
Split into simpler sentences: During WW2, the Kriegsmarine used Ruhleben Barracks for submarine crew training. Subsequently, they were renamed HMS Royal Alfred, from which the school's name evolved, and, then, Connaught Barracks by the British Army of the Rhine.