In plain words
I see You without beginning, middle, or end, of infinite power and countless arms, with moon and sun as Your eyes and blazing fire as Your mouth, heating this universe by Your own radiance.
Word for word
Without beginning, middle or end, of endless power, of endless arms, with moon and sun for eyes, I see You, with blazing fire for a mouth, scorching this universe with Your own radiance.
The commentators
Bhagavadgītābhāṣyam
किञ्च —
अनादिमध्यान्तम् आदिश्च मध्यं च अन्तश्च न विद्यते यस्य सः अयम् अनादिमध्यान्तः तं त्वां अनादिमध्यान्तम् , अनन्तवीर्यं न तव वीर्यस्य अन्तः अस्ति इति अनन्तवीर्यः तं त्वाम् अनन्तवीर्यम् , तथा अनन्तबाहुम् अनन्ताः बाहवः यस्य तव सः त्वम् , अनन्तबाहुः तं त्वाम् अनन्तबाहुम् , शशिसूर्यनेत्रं शशिशूर्यौ नेत्रे यस्य तव सः त्वं शशिसूर्यनेत्रः तं त्वां शशिसूर्यनेत्रं चन्द्रादित्यनयनम् , पश्यामि त्वां दीप्तहुताशवक्त्रं दीप्तश्च असौ हुताशश्च वक्त्रं यस्य तव सः त्वं दीप्तहुताशवक्त्रः तं त्वां दीप्तहुताशवक्त्रम् , स्वतेजसा विश्वम् इदं समस्तं तपन्तम् ॥ १९ ॥
In plain words
And further —
You have no beginning, no middle, no end — none of these can be found in you. Your might has no limit. Your arms go on without number. The moon and the sun are your two eyes. And I see you with a mouth that is blazing fire itself — and with your own light alone, you are scorching this entire universe.
Close to the Sanskrit
And what more —
Without beginning, middle, or end — a beginning, a middle, and an end do not exist for whom, he, this one, is without beginning, middle, or end, him, you, without beginning, middle, or end; of endless might — your might's end does not exist, thus one of endless might, him, you, of endless might; likewise of endless arms — endless arms belong to whom, to you, he, you, one of endless arms, him, you, having endless arms; having moon and sun as eyes — the moon and sun are the two eyes of whom, of you, he, you, one whose eyes are moon and sun, him, you, having moon and sun as eyes, having the moon and sun for eyes; I see you having a mouth of blazing fire — blazing, this, and fire, the mouth of whom, of you, he, you, one whose mouth is blazing fire, him, you, having a mouth of blazing fire, scorching, by your own splendor, this entire universe.