Complex sentence: The coast of Namibia is host to economic diamondiferous beach sands, which are exploited by building sea walls and isolating stretches of coastline, the beaches so isolated being processed in their entirety down to the bedrock in search of diamonds.
Split into simpler sentences: The coast of Namibia is host to economic diamondiferrous beach sands, which are exploited by building sea walls and isolating stretches of coastline. The beaches are so isolated that they are somtimes processed in their entirety, down to the bedrock, in search of diamonds.