Complex sentence: The term Isleño American applied to a set of peoples from the southern United States that descended from Spanish settlers originating from the Canary Islands that arrived there in the XVIII century, and who have preserved the culture of their ancestors.
Split into simpler sentences: The term Isleño American applies to a people from the southern United States who descended from Spanish settlers originating from the Canary Islands. They arrived in the XVIII century and have preserved the culture of their ancestors.