Multiple sentences

Using multiple full sentences to "translate" or describe a concept is not only okay, but encouraged.

Sentences are clearer than phrases

Cramming into noun phrases

The particles that mark sentence structure, such as li and e, are essential for clarifying the roles of words and the relationships between them. Relationships between sentences can also be clarified through ni ("that"), la phrases, taso ("however"), kin ("also"), and reusing content words described in previous sentences.

In Toki Pona, you cannot fit this relational information into a single noun phrase. Modifiers and pi phrases only indicate some pertinence to the head word, but say nothing about how they are related. Multiple pi phrases are grammatically ambiguous, and speakers prefer it that way.

Overall, if you try to cram a concept into one phrase, it will be very difficult to interpret what you are talking about. Keep practicing your grammar on the sentence level. Keep each sentence relatively simple as you explain complex things.

Cramming into verb phrases

There is also a temptation to use complicated or forced verb phrases, especially with pi. This may be from a lack of familiarity with particles, preverbs, or adverbial la phrases.

mi sona pi toki pona.
mi sona pi toki pona.

I know in a good-speech way

mi sona e toki pona.
mi sona e toki pona.

I know good speech. (The particle e marks the direct object, toki pona.)

mi sona toki pona.
mi sona toki pona.

I know how to speak well. (Here sona is used as a preverb meaning "to know how". toki has no preverb definition, so it must be the main verb.)

Granted, there are different uses where pi in a verb phrase can feel natural.

Proficient speakers often think of S li V e O as "S causes O to (be) V". In that sense, the verb can be like another (short) noun phrase:

ona li lawa pi ma ale e waso.
ona li lawa pi ma ale e waso.

They made a bird the ruler of all lands.

Build context over multiple sentences

Toki Pona is about building up the context needed to present a complicated idea. It is normal for the setup and the main idea itself to take multiple sentences.

In practice

lipu Wikipesija has partially adopted full sentences for article titles, which of course are elaborated upon with more sentences in the article body. For example, the article on the Russo-Ukrainian War is titled ma Lusi en ma Ukawina li utala ("The land of ruskʲɪj and the land of ʊkrɐjinɐ do battle"). It does not try to calque the English term by kludging this information into an awkward noun phrase, like utala pi ma Lusi pi ma Ukawina.