Complex sentence: Cord played a younger son of Ben Sanford (Dan Duryea) and a younger brother of Carl Sanford (Jason Evers), who seek vengeance for the killing of their other son and brother.
Split into simpler sentences: Cord played a younger son of Ben Sanford (Dan Duryea) and a younger brother of Carl Sanford (Jason Evers). Ben and Carl seek vengeance for the killing of their other son and brother.