Complex sentence: Mismanagement of waste water treatment from urban zones within the Hartbeespoort Dam catchment area is largely to blame, having distorted the food web with over 280 tons of phosphate and nitrate deposits.
Split into simpler sentences: Mismanagement of waste water treatment from urban zones within the Hartbeespoort Dam catchment area are largely to blame. Distorting the food web with over 280 tons of phosphate and nitrate deposits.