Complex sentence: In the story, the English had built a mission school for the natives African children to study, suggesting that this was during a time when race relations were improving among the English and Rhodesians, but also that the English were still very much involved with Rhodesia.
Split into simpler sentences: In the story, the English had built a mission school for the natives African children to study. This obviously implies that this was during a time when race relations were improving among the English and Rhodesians, but that the English were still very much involved with Rhodesia.