Complex sentence: Eventually, as the addictive properties of the drug became known, governments began to place strict controls on the sale of amphetamine; for example, during 1970 in the United States, amphetamine became a schedule II controlled substance under the Controlled Substances Act.
Split into simpler sentences: Eventually, as the addictive properties of the drug became known, governments began to place strict controls on the sale of amphetamine. For example, during 1970 in the United States, amphetamine became a schedule II controlled substance under the Controlled Substances Act.