Complex sentence: Under the Laws in Wales Acts 1535--1542, Wales was formally made part of single state with England, it was shired on the English pattern, and Monmouthshire uniquely was made part of the English assize system.
Split into simpler sentences: Under the Laws in Wales Acts 1535--1542, Wales was formally made part of single state with England. It was shired on the English pattern, and Monmouthshire, uniquely, was made part of the English assize system.