Complex sentence: This mixture is then bottled with added sugar and (usually) glycerine, producing a smooth, syrup-like drink with an alcohol content of between 15% and 50% ABV (30--100 proof).
Split into simpler sentences: This mixture is then bottled with added sugar and (usually) glycerine, producing a smooth, syrup-like drink. Their alcohol content can be between 15% and 50% ABV (30--100 proof).