Complex sentence: The drug is easily made from codeine, iodine and red phosphorus, in a process similar to the manufacture of methamphetamine from pseudoephedrine; like methamphetamine, desomorphine made this way is often highly impure and is contaminated with various toxic and corrosive byproducts.
Split into simpler sentences: The drug is easily made from codeine, iodine and red phosphorus, in a process similar to the manufacture of methamphetamine from pseudoephedrine. Like methamphetamine, desomorphine made this way is often highly impure and is contaminated with various toxic and corrosive byproducts.