Complex sentence: The first prototype flew on 23 October 1943, second on 15 February 1944, third on 11 July 1944 and all three were built at Vickers secret dispersed Foxwarren Experimental Department between Brooklands and nearby Cobham.
Split into simpler sentences: The first prototype flew on 23 October 1943, the second on 15 February 1944, and the third on 11 July 1944. All three were built at Vickers' secret dispersed Foxwarren Experimental Department between Brooklands and nearby Cobham.