Learn Farsi: این سنگ‌تراش بی‌همتاترین مجسمه‌ها را خلق کرد. - This sculptor created the most peerless of statues.

The phrase is بی‌همتاترین مجسمه‌ها (pronounced bi-hamtā-tarin-e mojasame-hā). The unwritten Ezafe (-e) connects the superlative adjective بی‌همتاترین (the most peerless) to the plural noun مجسمه‌ها (statues). In Farsi, linking a superlative directly to a plural noun using an Ezafe creates this exact partitive meaning: "the [superlative] of [plural noun]".

How does the word سنگ‌تراش literally translate to "sculptor"?

It is a compound noun built from سنگ (stone) and تراش, which is the present stem of the verb تراشیدن (to carve, shave, or sculpt). Literally, it translates to "stone-carver".

In English, "most peerless" sounds a bit redundant. Is adding ترین to بی‌همتا completely normal in Farsi?

Yes, Farsi is much more flexible with absolute adjectives than English is. The word بی‌همتا is composed of بی (without) and همتا (peer or equal). Adding the superlative suffix ترین is a common and perfectly correct way to add dramatic emphasis, meaning it is the absolute most unrivaled thing in its category.

Does the object marker را belong just to مجسمه‌ها or to the whole phrase?

It applies to the entire noun phrase بی‌همتاترین مجسمه‌ها. Because this superlative partitive construction specifies exactly which statues the sculptor created ("the most peerless of statues"), the phrase acts as a definite direct object for the verb (created), which makes the mandatory here.