Complex sentence: Many Parsis settled on Zanzibar to work as merchants and civil servants for the colonial government, forming one of the largest Parsi colonies outside of India that lasted until the Zanzibar Revolution of 1964.
Split into simpler sentences: Many Parsis settled on Zanzibar to work as merchants and civil servants for the colonial government. They formed one of the largest Parsi communities outside of India, a community that survived until the Zanzibar Revolution of 1964.