Complex sentence: Russian Caravan is not a Russian blend, however is Chinese-it has a distinctive smoky aroma, originating from the quantity of Lapsang Souchong which is blended with it to act as a preservative.
Split into simpler sentences: Russian Caravan is not a Russian blend, however, but Chinese. It has a distinctive smoky aroma, originating from the quantity of Lapsang Souchong which is blended with it to act as a preservative.