Complex sentence: The last Muslim threat to the Christian kingdoms was the rise of the Marinids in Morocco during the 14th century, who took Granada into their sphere of influence and occupied some of its cities, like Algeciras.
Split into simpler sentences: The last Muslim threat to the Christian kingdoms was the rise of the Marinids in Morocco during the 14th century. They took Granada into their sphere of influence and occupied some of its cities, like Algeciras.