Complex sentence: In most other countries, dihydromorphine is classified at the same level as morphine, pethidine and the like where it is available and used; international law and treaties list it as a narcotic subject to control, and other countries' laws may vary.
Split into simpler sentences: In most other countries, dihydromorphine is classified at the same level as morphine, pethidine and the like where it is available and used. International law and treaties list it as a narcotic subject to control, and other countries' laws may vary.