In plain words
The individual, made turbid by ignorance, grows clear through the practice of knowledge. Then that knowledge too, having removed the ignorance, passes away, like the powder of the clearing-nut that takes the dirt out of water.
Word for word
The individual clouded by ignorance becomes clear through the practice of knowledge. That [operative] knowledge too subsides after removing ignorance, like clearing-nut powder that removes impurity from water.