Complex sentence: Out ranging beyond the Wall, Jon Snow and the Night's Watch find the corpses of two of their fallen brothers; after bringing them home to Castle Black, the dead men rise and kill several men before they are destroyed.
Split into simpler sentences: Out ranging beyond the Wall, Jon Snow and the Night's Watch find the corpses of two of their fallen brothers. Brought home to Castle Black, the dead men rise and kill several of their living fellows before they are destroyed.