Complex sentence: As Llechryd is the first point on the river Teifi to the East of Cardigan where, due to the gorge at Cilgerran, crossing is possible, it is perfectly feasible that such a crossing existed prior to the building of the bridge.
Split into simpler sentences: As Llechryd is the first point on the river Teifi to the East of Cardigan where, due to the gorge at Cilgerran, crossing is possible. It is perfectly feasible that such a crossing existed prior to the building of the bridge.