Bhāṣya
। । । । ॥
In plain words
Before quintuplication, the five mahābhūtas, the great elements, are the five tanmātras, the subtle elements. From them come the five prāṇas, the vital breaths; the ten indriyas, the faculties of sense and action; Manas, the mind; and Buddhi, the intellect. Together these seventeen form the elemental liṅga, the subtle body called Hiraṇyagarbha. This is Ātma’s sūkṣma śarīra, its subtle body. When the karaṇas, the faculties, draw inward, a cognition arises from the saṃskāras, the impressions of waking, together with its object: this is svapna, dream. The Ātma that takes both the subtle body and dream to be itself is Taijasa. These three make up U-kāra, the sound U.
Close to the Sanskrit
The five mahābhūtas, the great elements, not yet quintuplicated are the five tanmātras, the subtle elements; and their effects—the five prāṇas or vital breaths, the ten indriyas or sense and action faculties, Manas or mind, and Buddhi or intellect—form the seventeenfold liṅga, the elemental subtle body called Hiraṇyagarbha. This is the sūkṣma śarīra, the subtle body, of Ātma, the Self. When the karaṇas, the faculties, are withdrawn, the cognition born of the saṃskāras, the impressions of waking, together with its object, is called svapna, dream. The Ātma that identifies with both of these is Taijasa. This triad is U-kāra, the sound U.