Complex sentence: Because of the alcohol content, it is possible to fail a breathalyzer test after rinsing although breath alcohol levels return to normal after 10mins; in addition, alcohol is a drying agent and may worsen chronic bad breath.
Split into simpler sentences: Because of the alcohol content, it is possible to fail a breathalyzer test after rinsing although breath alcohol levels return to normal after 10 minutes. In addition, alcohol is a drying agent and may worsen chronic bad breath.