Śrīmad-Bhāgavatam 8.7.16
మథ్యమానాత్ తథా సిన్ధోర్దేవాసురవరూథపై: ।
యదా సుధా న జాయేత నిర్మమన్థాజిత: స్వయమ్ ॥ ౧౬ ॥
mathyamānāt tathā sindhor
[mathyamaanaat tathaa sindhor]
devāsura-varūtha-paiḥ
[devaasura-varootha-paih]
yadā sudhā na jāyeta
[yadaa sudhaa na jaayeta]
nirmamanthājitaḥ svayam
[nirmamanthaajitah svayam]
Word-for-word
mathyamānāt
—
sufficiently being churned
tathā
—
in this way
sindhoḥ
—
from the Ocean of Milk
deva
—
of the demigods
asura
—
and the demons
varūtha-paiḥ
—
by the best
yadā
—
when
sudhā
—
nectar
na jāyeta
—
did not come out
nirmamantha
—
churned
ajitaḥ
—
the Supreme Personality of Godhead, Ajita
svayam
—
personally.
Blended reading (Sanskrit + English inline)
mathyamānāt tathā sindhor
mathyamānāt
sufficiently being churned
tathā
in this way
sindhoḥ
from the Ocean of Milk
devāsura-varūtha-paiḥ
deva
of the demigods
asura
and the demons
varūtha-paiḥ
by the best
yadā sudhā na jāyeta
yadā
when
sudhā
nectar
na jāyeta
did not come out
nirmamanthājitaḥ svayam
nirmamantha
churned
ajitaḥ
the Supreme Personality of Godhead, Ajita
svayam
personally.
When nectar did not come from the Ocean of Milk, despite so much endeavor by the best of the demigods and demons, the Supreme Personality of Godhead, Ajita, personally began to churn the ocean.
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
When nectar did not appear from the ocean of milk from churning by the best of the devatās and demons, Ajita personally began to churn the ocean.
The nectar did not come out because first the impure parts had to be taken out. Only then could the nectar appear.
My note
Source: vedabase.io