। ॥ ३४२ ॥
In plain words
The five sattvic portions seated in ākāśa and the other elements blended together with one another — and just from that mingling, nothing more, the antaḥkaraṇa came to be: the inner instrument, the cause of everything.
Close to the Sanskrit
The five sattvic portions residing in ākāśa and the rest, having combined with one another alone, became the inner organ (antaḥkaraṇa), the cause of all.