Complex sentence: Islanders who belong to the Shirazi ethnic group claim descent from Persian royalty which reputedly arrived in the ninth century, and there are important ruins at Makutani in the southeast of the island which were once one of Zanzibar's main settlements.
Split into simpler sentences: Islanders who belong to the Shirazi ethnic group claim descent from Persian royalty that reputedly arrived in the ninth century. Important ruins at Makutani in the south-east of the island were one of Zanzibar's main settlements.