Complex sentence: Of the 9,825 men of the 32nd Division who entered combat, 7,125 (66%) were casualties due to illness (with 2,952 requiring hospitalization), 586 were killed in action, 1,954 were wounded in action, and 100 more died from other causes.
Split into simpler sentences: Of the 9,825 men of the 32nd Division who entered combat, the division suffered 2,520 battle casualties, including 586 killed in action. More telling was the huge number who were casualties due to illness: 7,125 (66%, with 2,952 requiring hospitalization), and 100 more died from other causes.