Complex sentence: It was developed in the late 1960s and has since been used in France and several other European countries, and although pyrovalerone is still occasionally prescribed, it is used infrequently due to problems with abuse and dependence.
Split into simpler sentences: It was developed in the late 1960s and has since been used in France and several other European countries. Though pyrovalerone is still occasionally prescribed, it is used infrequently due to problems with abuse and dependence.