In plain words
There are two kinds of beings brought forth in this world: the divine and the āsura. The divine has been described in detail; now hear from Me about the āsura, Partha.
Word for word
Two creations of beings [are] in this world, the divine and the āsura too; the divine has been told in detail; hear the āsura from me, O Pārtha.
द्वौ भूतसर्गौ लोकेऽस्मिन् दैव आसुर एव चदैवो विस्तरशः प्रोक्त आसुरं पार्थ मे शृणु
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam· bhāṣya
द्वौ द्विसङ्ख्याकौ भूतसर्गौ भूतानां मनुष्याणां सर्गौ सृष्टी भूतसर्गौ सृज्येतेति सर्गौ भूतान्येव सृज्यमानानि दैवासुरसम्पद्द्वययुक्तानि इति द्वौ भूतसर्गौ इति उच्यते, ‘द्वया ह वै प्राजापत्या देवाश्चासुराश्च’(बृ. उ. १ । ३ । १) इति श्रुतेः । लोके अस्मिन् , संसारे इत्यर्थः, सर्वेषां द्वैविध्योपपत्तेः । कौ तौ भूतसर्गौ इति, उच्यते — प्रकृतावेव दैव आसुर एव च । उक्तयोरेव पुनः अनुवादे प्रयोजनम् आह — दैवः भूतसर्गः ‘अभयं सत्त्वसंशुद्धिः’(भ. गी. १६ । १) इत्यादिना विस्तरशः विस्तरप्रकारैः प्रोक्तः कथितः, न तु आसुरः विस्तरशः ; अतः तत्परिवर्जनार्थम् आसुरं पार्थ, मे मम वचनात् उच्यमानं विस्तरशः शृणु अवधारय ॥ ६ ॥
In plain words
Two -- that's the count. Two creations of living beings: call it the birth of human beings under two names. They're called 'creations' because this is what is actually being created, born, right now -- every being that comes into existence carries one portion or the other, the divine share or the demonic. That's why the verse speaks of 'two creations of beings', resting on the Upanishad's own word: 'Twofold indeed were the children of Prajapati -- gods and demons' (Brhadaranyaka Upanisad 1.3.1). 'In this world' simply means 'in samsara' -- because this divide runs through everything here. So which two creations are these? Here is the answer: within nature itself, nothing but the divine and the demonic. And why name again what has already been named? Because the divine nature was already laid out in full, starting from 'fearlessness, purity of being' (Bhagavad Gita 16.1) onward -- but the demonic hasn't been. So now, so that you may set it aside, Arjuna: hear the demonic nature, this time told in full, from my own mouth -- listen, and hold it firmly in mind.
Close to the Sanskrit
The two, numbering two, are the two creations of beings -- the two creations, that is births, of men; called 'creations' because the two creations of beings 'are being created' -- so 'creations', since the beings themselves, precisely as they are being created, are endowed with the pair, the divine portion and the demonic portion; thus it is said 'the two creations of beings', on the authority of the scripture 'Twofold indeed were the offspring of Prajapati -- gods and demons' (Brhadaranyaka Upanisad 1.3.1). 'In this world' means 'in transmigratory existence' -- that is the meaning -- because all things admit of this twofold division. Which are those two creations of beings? It is answered: within nature itself, the divine and the demonic alone. Now, to state again the purpose of restating what was already said, it is said: the divine creation has already been taught at length, in its many details, beginning with 'fearlessness, purity of being' (Bhagavad Gita 16.1); but the demonic has not been taught at length. Therefore, in order to set that aside, hear the demonic, O Partha, being spoken now at length, at my own word -- hear it and grasp it fully.