Complex sentence: Freeze distillation of alcoholic beverages is illegal in many countries, as it can concentrate poisonous compounds, for example fusel alcohols, in the original fermented beverage to unhealthy levels; heated distillation methods tend to eliminate these more harmful fermentation products.
Split into simpler sentences: Freeze distillation of alcoholic beverages is illegal in many countries, as it can concentrate poisonous compounds, for example fusel alcohols, in the original fermented beverage to unhealthy levels. Heated distillation methods tend to eliminate these more harmful fermentation products.