Complex sentence: The government in exile say they knew that the CIA trained and equipped Tibetan guerrillas who raided Tibet from a base camp in Nepal, and that the effect of those operations only resulted in more suffering for the people of Tibet.
Split into simpler sentences: The government in exile say they knew that the CIA trained and equipped Tibetan guerrillas who raided Tibet from a base camp in Nepal. And that the effect of these operations only resulted in more suffering for the people of Tibet.