turīya - transcendental; viśuddha-sattva - pure existence; saṅkarṣaṇa nāma - named Saṅkarṣaṇa; tiṅho yāṅra amśa - of whom that Saṅkarṣaṇa is also a partial expansion; sei nityānanda-rāma - that person is known as Balarāma or Nityānanda.

That Saṅkarṣaṇa, who is transcendental pure goodness, is a partial expansion of Nityānanda Balarāma.