Complex sentence: The tramway rose by three inclines through Maen Offeren quarry to reach the plateau, where it ran on an approximately level course east towards Cwt y Bugail Quarry.
Split into simpler sentences: The tramway rose by three inclines through Maen Offeren quarry to reach the plateau. From the head of No.3 incline, the tramway ran on an approximately level course east towards Cwt y Bugail Quarry.