Complex sentence: While in Africa, he was confronted with massive and wasteful killing of animals, political unrest and human tragedies and he returned to America with the intent to produce films that argued for nature conservation.
Split into simpler sentences: While in Africa, he was confronted with the massive and wasteful killing of animals, political unrest and human tragedies. As a result, he returned to America with the intent to produce films that argued for nature conservation.