Complex sentence: When he applied, they turned him down, for apparently he did't fulfill their requirements, since they only accept huntsmen whose heads have parted company with their bodies (a complete decapitation) and Nick still has half an inch of skin holding his neck on.
Split into simpler sentences: When he applied, they turned him down, for apparently he didn't fulfill their requirements. They only accept huntsmen whose heads have entirely parted company with their bodies (a complete decapitation) and Nick still has half an inch of skin holding his neck on.