Complex sentence: The motorway has created a lot of problems for the park due to the run off that comes from the motorway, all the salts, oils and litter polluted the natural balance of the lake otherwise known as Croome River.
Split into simpler sentences: The motorway has created a lot of problems for the park due to the runoff that comes from the motorway. The salts, oils and litter have polluted the natural balance of the lake otherwise known as Croome River.