Complex sentence: In recent decades, an increase in the population who only occasionally drink wine has led to an increase in the sweetness of many cheap wines, and as a result medium and sweet wines have a perception among many drinkers of being of lower quality than dry wines.
Split into simpler sentences: In recent decades, an increase in the population who only occasionally drink wine has led to an increase in the sweetness of many cheap wines. As a result, medium and sweet wines have a perception among many drinkers of being of lower quality than dry wines.