In plain words
Having attained the worlds of the meritorious and lived there for countless years, one who fell from yoga is born in a pure and prosperous family.
Word for word
Having reached the worlds of the doers of merit [and] having dwelt [there] endless years, one fallen from yoga is born in the house of the pure [and] prosperous.
प्राप्य पुण्यकृतां लोकानुषित्वा शाश्वतीः समाःशुचीनां श्रीमतां गेहे योगभ्रष्टोऽभिजायते
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam
किं तु अस्य भवति ? —
योगमार्गे प्रवृत्तः संन्यासी सामर्थ्यात् प्राप्य गत्वा पुण्यकृताम् अश्वमेधादियाजिनां लोकान् , तत्र च उषित्वा वासमनुभूय शाश्वतीः नित्याः समाः संवत्सरान् , तद्भोगक्षये शुचीनां यथोक्तकारिणां श्रीमतां विभूतिमतां गेहे गृहे योगभ्रष्टः अभिजायते ॥ ४१ ॥
In plain words
But then what happens to such a person? —
The renunciant who had been on the path of yoga, by the strength gained there, reaches the worlds of those who performed meritorious deeds—those who did horse-sacrifices and the like—and dwells there, living out that residence, for many, many years. Once that enjoyment runs out, the one fallen from yoga is born into the household of the pure, of those who live rightly, the prosperous and wealthy.
Close to the Sanskrit
But what, for him, comes to be? —
The renunciant who was engaged on the path of yoga, having attained—i.e. gone, by virtue of the strength of that practice, to the worlds of those who performed meritorious deeds—namely performers of the horse-sacrifice and the like—and having dwelt there—i.e. having experienced that residence—for many, i.e. very many, years—when that enjoyment is exhausted, one fallen from yoga is born in the house, i.e. home, of the pure, of those who act as prescribed, of the prosperous, i.e. the wealthy.