Complex sentence: Plastisol is used for "slush molding" or "slush casting", a form of spin casting that is more complex than relatively simple resin casting, but less expensive and less sophisticated than the injection molding used for most plastic products.
Split into simpler sentences: Plastisol is used for "slush molding" or "slush casting". It is a form of spin casting that is more complex than relatively simple resin casting, but less expensive and less sophisticated than the injection molding used for most plastic products.