Complex sentence: During World War I he served for 10 months as an inspector with the rank of lieutenant in the United States Army Ordnance Department; stricken with pneumonia and influenza, he was honorably discharged in January 1919.
Split into simpler sentences: During World War I, he served for ten months as an inspector with the rank of lieutenant in the United States Army Ordnance Department. Stricken with pneumonia and influenza, he was honorably discharged in January 1919.