Complex sentence: Fairnholt, a corporal, was assigned to the anti-tank platoon of Headquarters Company, 3rd Battalion, in which he initially served as an assistant gun-crew chief manning a 57mm towed anti-tank gun.
Split into simpler sentences: Fairnholt, a corporal, was assigned to the anti-tank platoon of Headquarters Company, 3rd Battalion. Farinholt was the assistant gun-crew chief manning a 57mm towed anti-tank gun.