Complex sentence: The families of both men claimed that the Việt Cộng officer in the photo looks very similar to their relative but neither family could say for sure since the Việt Cộng officer's face was swollen due to severe beating by South Vietnamese police prior to the execution.
Split into simpler sentences: The families of both men claimed that the Việt Cộng officer in the photo looks very similar to their relative. Neither family could say for sure, because the Việt Cộng officer's face was swollen due to a severe beating by South Vietnamese police prior to the execution.