Complex sentence: The voice appeared as a woman talking in a language that could not be understood, but another woman's voice, which Dr. Debhanom claimed to be the voice of an alien, was acting as an interpreter and translator in the alien group.
Split into simpler sentences: The voice appeared as a woman talking in a language that could not be understood. Another woman's voice, which Dr. Debhanom claimed to be the voice of an alien, was acting as an interpreter and translator in the alien group.