Complex sentence: Trichloroethylene (TCE) and perchloroethylene (PCE) are common targets of treatment which are directly converted to environmentally benign products; while chlorinated alkenes and alkanes are converted to hydrogen chloride (HCl) which is then neutralized with a base.
Split into simpler sentences: Trichloroethylene (TCE) and perchloroethylene (PCE) are common targets of treatment which are directly converted to environmentally benign products. Chlorinated alkenes and alkanes are converted to hydrogen chloride (HCl) which is then neutralized with a base.