। ॥ ९७ ॥
In plain words
That single life-force becomes five - prāṇa, apāna, vyāna, udāna, samāna - simply by taking on different functions, the way gold or water takes many different shapes without ceasing to be gold or water.
Close to the Sanskrit
That vital force itself becomes prāṇa, apāna, vyāna, udāna, and samāna, by difference of its functions — due to difference of modification, like gold and water [take various forms].