Original: As a private with the 423rd Infantry Regiment, 106th Infantry Division, Vonnegut was captured during the Battle of the Bulge on December 19, 1944, after the 106th was cut off from the rest of Courtney Hodges' First Army.
Simplified: He was a private with the 423rd Infantry Regiment, 106th Infantry Division. Vonnegut was captured during the Battle of the Bulge on December 19, 1944.