Complex sentence: In the seven months of the Gallipoli Campaign they had 127 dead, fourteen of those died of illness, 113 were killed in action, while another forty-six, not included in that total, were reported missing believed dead.
Split into simpler sentences: In the seven months of the Gallipoli Campaign they had 127 dead; fourteen of those died of illness and 113 were killed in action. Another forty-six, not included in that total, were reported missing believed dead.