Complex sentence: The intermediates, major, and minor products can then be broken down into CO 2, H 2 O, NH 3, and Cl -, which can cause toxicity in aquatic sediments after it has seeped through.
Split into simpler sentences: The intermediates, major, and minor products can then be broken down into CO 2, H 2 O, NH 3, and Cl -. The ammonia and chloride ions can cause toxicity in aquatic sediments after it has seeped through.