Complex sentence: He fought in battles that liberated the towns of Bruyères and Biffontaine, but was severely wounded by a gunshot from an enemy soldier in Biffontaine, and after a while, returned to Los Angeles for a 6-month break in late 1944.
Split into simpler sentences: He fought in battles that liberated the towns of Bruyères and Biffontaine. He sustained severe wounds from enemy fire in Biffontaine, and after a while, returned to Los Angeles for a 6-month leave in late 1944.