Complex sentence: Under current federal drug policy, industrial hemp can be imported into the United States; however, if H.R.1866 passes American farmers will be promitted to compete in global hemp markets.
Split into simpler sentences: Under current federal drug policy, American farmers are prohibited from growing hemp; however, you can import hemp into the United States from other countries. If H.R.1866 passes American farmers will be permitted to compete in global hemp markets.