Complex sentence: Ernst proposes that Harry and him join forces to release Holtz to find out the location of the gold; after some discussion about a fellow inmate of the concentration camp named Sergeant Prior, they discuss tentative ideas for releasing Holtz.
Split into simpler sentences: Ernst proposes that he and Harry join forces to release Holtz, to find out the location of the gold. After some discussion about a fellow inmate of the concentration camp, named Sergeant Prior, they discuss tentative ideas for releasing Holtz.