In plain words
Among daityas I am Prahlada; among those who reckon I am Time; among beasts I am the lion; among birds I am Garuda.
Word for word
And I am Prahlāda among the Daityas; Time among those who reckon [am] I; and among beasts the lord of beasts [am] I, and Vainateya among birds.
The commentators
Bhagavadgītābhāṣyam· bhāṣya
प्रह्लादो नाम च अस्मि दैत्यानां दितिवंश्यानाम् । कालः कलयतां कलनं गणनं कुर्वताम् अहम् । मृगाणां च मृगेन्द्रः सिंहो व्याघ्रो वा अहम् । वैनतेयश्च गरुत्मान् विनतासुतः पक्षिणां पतत्रिणाम् ॥ ३० ॥
In plain words
Among the demons, the descendants of Diti, I am the one named Prahlāda. Among all who calculate and reckon, I am Time itself. Among beasts, I am their king — the lion, or the tiger. And among birds, among every winged creature, I am Vainateya, Garutmān, the son of Vinatā.
Close to the Sanskrit
And I am he named Prahlāda, among demons, the descendants of Diti's lineage. Time, of those who reckon — of those who do reckoning, counting — I. And of beasts, the king of beasts, the lion, or the tiger, I. And Vainateya, Garutmān, the son of Vinatā, of birds, of winged creatures.