रुच्यर्थानां प्रीयमाणः

Definition saṃjñā कारकसंज्ञाDefinition saṃjñā सम्प्रदानसंज्ञा

In case of verbs having the signification of the root रुच् 'to like', the person or thing that is pleased or satisfied, is called सम्प्रदान or recipient.

Word by word (padaccheda)

Of रुचि- अर्थानाम् ṣaṣṭhī · bahuvacanaTerm / subject प्रीयमाणः prathamā · ekavacana

Of Ṣaṣṭhī (6th case): "of X". In this kind of sūtra it marks a relation, not a substitution.
Term / subject Prathamā (1st case): the term being defined, or the subject of the statement.

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Full reading

रुचि-अर्थानाम् प्रीयमाणः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

In case of verbs having the signification of the root रुच् 'to like', the person or thing that is pleased or satisfied, is called सम्प्रदान or recipient.
The verbs having similar meaning (artha) as the word ruchi or 'liking' are रुच्यर्थ. A desire or longing caused by something else, is called ruchi. As देवदत्ताय रोचते मोदकः the sweet meat pleases Devadatta. यज्ञदत्ताय स्वदते ऽपूपः Yajnadatta likes Apupa. Here modaka is the agent that draws out the longing which is latent in Devadatta.

Why do we say 'the person pleased'? Observe देवदत्ताय रोचते मोदकः पथि. Devadatta likes modak in the way. The word pathi being in the 7th case.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.