Complex sentence: During the battle, Jin-tae captures an important North Korean captain and is finally awarded with the medal; however, a close friend named Yong-man died in the process, frustrating Jin-seok.
Split into simpler sentences: During the battle, Jin-tae captures an important North Korean captain and is finally awarded with the medal. But at the cost of the life of a close friend named Yong-man, frustrating Jin-seok.