Complex sentence: At the same time 466 men were debilitated or wounded in action at Gallipoli, and another 254 were wounded during the latter campaign, a total of 720 wounded for both campaigns.
Split into simpler sentences: At the same time 466 men were debilitated or wounded in action at Gallipoli, and another 254 were wounded during the latter campaign. For a total of 720 wounded for both campaigns.