Original sentence: In the late 1140s, the lordship of Whittington, like Oswestry and Overton ceased to be part of England and became part of in the Kingdom of Powys and then became Welsh marcher lordship
Edited sentence: In the late 1140's the lordship of Whittington, like Oswestry, Ellesmere and Overton ceased to be part of England and reverted to a part of Wales as part of the cantref of Maelor and then became a marcher lordship