Complex sentence: The chosen site was called Beaumaris and was about from the Welsh town of Llanfaes and the decision was therefore taken to move the Welsh population some south-west, where a settlement by the name of Newborough was created for them.
Split into simpler sentences: The chosen site was called Beaumaris and was about from the Welsh town of Llanfaes. The decision was therefore taken to move the Welsh population some south-west, where a settlement by the name of Newborough was created for them.