Complex sentence: However, Builth may have had important significance in Welsh language culture as The Mabinogion was long thought to have been recorded in its final form by medieval monks here and recent historical opinion has shifted to a view that it was written down by a lawyer in Builth.
Split into simpler sentences: However, Builth may have had important significance in Welsh language culture. Recent historical opinion has shifted to a view that it was written down by a lawyer in Builth.