Complex sentence: Its most characteristic landmark is Wilpena Pound, a giant sickle-shaped formation which creates the effect of a remarkable natural amphitheatre covering nearly 80 square kilometres and contains the ranges highest peak, St Mary Peak, at 1170 metres.
Split into simpler sentences: Its most characteristic landmark is Wilpena Pound, a large, sickle-shaped, natural amphitheatre covering nearly 80 square kilometres. It contains the range's highest peak, St Mary Peak, at 1170 metres.