Complex sentence: He found he was most tempted by the social injustices that he had become aware of, issues like the horrors of the Viet Nam War, the poverty and oppressive conditions of indigenous Australians, and then, amazement at the institutionalised racism of apartheid.
Split into simpler sentences: He found he was most tempted by the social injustices that he had become aware of. Issues like the horrors of the Viet Nam War, the poverty and oppressive conditions of indigenous Australians, and then, amazement at the institutionalised racism of apartheid.