Complex sentence: When the aged liquor is heated, it vaporizes, and the vaporized steam is cooled by the cold water in the upper parts of the "soju gori" causes the vaporized alcohol to be condensed and trickle down through the pipe.
Split into simpler sentences: When the aged liquor is heated, it vaporizes, and the vaporized steam is cooled by the cold water in the upper parts of the "soju gori". This causes the vaporized alcohol to be condensed and trickle down through the pipe.