Complex sentence: The first official documentation of the village was in the 10th century, declaring that the village was an estate belonging to the Cockington family, who owned the estate from 1078 to 1348.
Split into simpler sentences: The first official documentation of the village was in the 10th century, declaring that the village was an estate belonging to the Cockington family. The Cockington family owned the estate from 1078 to 1348.