Complex sentence: It has the asymmetrical cross-section typical of a half-graben, bounded on the north side by a fault zone that slopes steeply down to the axis of the basin, while the southern side slopes down more gently.
Split into simpler sentences: It has the asymmetrical cross-section typical of a half-graben. The northern side is a fault zone that slopes steeply down to the axis of the basin, while the southern side slopes down more gently.