Learn Farsi: آکروبات جسارت خود را روی تشک به سادگی نشان داد. - The acrobat effortlessly showed his boldness on the mat.

This is our target structure. It literally means "with simplicity." It is formed using the preposition be and the abstract noun sâdegi (simplicity). Because the root adjective sâde (simple) ends in an unspoken "e", we add a "g" to bridge the gap before adding the abstract noun suffix -i. Together, they form a productive adverb of manner.

Why use the reflexive pronoun khod instead of just the possessive ending -ash for "his"?

While you could say jesârat-ash râ, using jesârat-e khod râ emphasizes that he showed "his own" boldness. It sounds slightly more literary and polished, which is very common in written Farsi at the B2 level.

Let's review the position of râ. Why does it come after khod instead of right after the main object jesârat?

The word râ marks the entire definite direct object. Because "his boldness" is a single noun phrase linked by the ezafe (jesârat-e khod), the marker râ must wait to attach at the very end of that complete phrase.

Why is the adverbial phrase be sâdegi placed right before the verb?

Adverbs of manner in Farsi typically sit immediately before the verb, or right before the verbal part of a compound verb. Placing it directly between the location (ruy-e toshak) and the compound verb (neshân dâd) represents the most natural word order.