Complex sentence: Porth Ysgo, owned by the National Trust, is reached by a steep slope from Llanfaelrhys, east of Aberdaron, past a disused manganese mine in Nant y Gadwen; the mine closed in 1927, and produced in its lifetime.
Split into simpler sentences: Porth Ysgo, owned by the National Trust, is reached by a steep slope from Llanfaelrhys, east of Aberdaron, past a disused manganese mine in Nant y Gadwen. The mine closed in 1927, and produced in its lifetime.