Complex sentence: In addition, amphetamine is also used by some professional, collegiate and high school athletes for its strong stimulant effects; however, in competitive sports, this form of use is prohibited by anti-doping regulations.
Split into simpler sentences: In addition, amphetamine is also used by some professional, collegiate and high school athletes for its strong stimulant effects. However, in competitive sports, this form of use is generally prohibited by anti-doping regulations.