Complex sentence: The location of the scarp must once have coincided with the location of the fault, but the scarp has since eroded about 15 kilometres eastwards, leaving a chain of foothills known as the Ridge Hill Shelf.
Split into simpler sentences: The location of the scarp must once have coincided with the location of the fault, but the scarp has since eroded about 15 kilometres eastwards. The original location of the scarp is indicated in places by an unusual landform known as the Ridge Hill Shelf.