Complex sentence: Promoted to first lieutenant, Sobel commanded Company E for all of their basic training at Camp Toccoa, Georgia He trained his men intensely, and was eventually promoted to the rank of captain in recognition of his ability as a trainer.
Split into simpler sentences: Promoted to first lieutenant, Sobel commanded Company E for all of their basic training at Camp Toccoa, Georgia. He also trained his men intensely, and was eventually promoted to the rank of captain in recognition of his ability as a trainer.