Complex sentence: At Arromanches, the first Phoenix was sunk at dawn on 9 June 1944 by 15 June a further 115 had been sunk to create a five-mile-long arc between Tracy-sur-Mer in the west to Asnelles in the east.
Split into simpler sentences: At Arromanches, the first Phoenix was sunk at dawn on 9 June 1944. By 15 June a further 115 had been sunk to create a five-mile-long arc between Tracy-sur-Mer in the west to Asnelles in the east.