Bhashya
तथा स यथा शङ्खस्य ध्मायमानस्य शब्देन संयोज्य-मानस्य आपूर्यमाणस्य न बाह्यान् शब्दान् शक्नुयात्-इत्येवमादि पूर्ववत् ॥
In plain words
The same holds for the next line too: 'as when a conch is blown, joined with sound, filled with sound, no one can seize its scattered outer sounds' — and so on. Take it exactly as explained before.
Close to the Sanskrit
Likewise, [the clause] 'as, of a conch being blown, being united with sound, being filled up, one would not be able [to grasp] the external sounds' and so on, is to be understood as before.