Complex sentence: The normal annual recruitment for the Indian army was 15,000 men, during the course of the war over 800,000 men volunteered for the army and more than 400,000 volunteered for non combatant roles, in total almost 1.3 million men had volunteered for service by 1918.
Split into simpler sentences: The normal annual recruitment for the Indian army was 15,000 men, during the course of the war over 800,000 men volunteered for the army and more than 400,000 volunteered for non combatant roles. In total almost 1.3 million men had volunteered for service by 1918.