paramātmā - the Supersoul within the heart; yeṅho - who; teṅho - He; kṛṣṇera - of Lord Kṛṣṇa; eka - one; amśa - plenary portion; ātmāra - of the soul; ātmā - the soul; haya - is; kṛṣṇa - Lord Kṛṣṇa; sarva - of everything; avataṁsa - source.

“The Paramātmā, the Supersoul feature, is a plenary portion of the Supreme Personality of Godhead, who is the original soul of all living entities. Kṛṣṇa is the source of the Paramātmā.