Complex sentence: By the thirteenth century Maelor had been divided into numerous parts including Maelor Gymraeg based upon Wrexham, and Maelor Saesneg which included various Anglo-Norman lordships, namely Overton, Ellesmere, Whittington and Oswestry.
Split into simpler sentences: By the thirteenth century Maelor had been divided into numerous parts. There was Maelor Gymraeg based upon Wrexham and various Anglo-Norman lordships, namely Overton, Ellesmere, Whittington and Oswestry.