From that, arises life and from life, comes Shraddha–one-pointedness. Then, comes Akasa and then, the air, the light, the water and the earth; the vapour, the liquid, the solid and the organs of perception and of course, the mind and food, from food comes energy, and from energy comes austerity, then the capacity to chant, to work and then the worlds that are distinguished by their names.
I am trying to demystify the statements for you.
It is akin to these flowing rivers, tending towards the ocean, who upon reaching the ocean disappear; their Nama Rupa–names and shapes–are broken up, losing their individualities and therefore, upon merging are called simply the ocean.
In the same way, these sixteen parts tending towards the Person (Purusha), on reaching the Person, disappear.
Their names and shapes disappear into the Person upon reaching Him; and are called simply the Person. That One is without parts, immortal. This means all the sixteen parts that exist are compared to the sixteen rivers, which have their own individuality, their own names, their own shapes, and their own forms.
Then, they flow into the ocean and the sixteen parts are now one Ocean. They disappear!