Complex sentence: Published in "The Myvyrian Archaiology of Wales" this work became one of the most influential and best-known of Iolo's numerous literary and antiquarian forgeries, which give Morgannwg (Glamorgan) a central place in early and medieval Welsh history.
Split into simpler sentences: Published in "The Myvyrian Archaiology of Wales", the work became one of the most influential and best-known of Iolo's numerous literary and antiquarian forgeries. Like the rest of Iolo's work, it gives Morgannwg (Glamorgan) a central place in early and medieval Welsh history.