Learn Farsi: هیچ‌کس جز این محقق آن تحول را باور نکرد. - No one except this researcher believed that transformation.

In Farsi, when you use a negative word like هیچ‌کس (no one), the verb must also be made negative to agree with it. The sentence literally says "No one... did not believe." This double-negative structure is standard and required in Farsi.

Does the word جز (except) require an Ezafe to connect to the next words?

No. Here, جز acts as a simple preposition meaning "except" or "other than," and it links directly to این محقق (this researcher) without needing an Ezafe.

What is the difference between تحول (tahavvol) and the more common word تغییر (taghyir)?

While both mean "change," تحول is much stronger. It implies a major transformation, evolution, or a fundamental shift in state. تغییر is used for everyday, simple changes.

Why does را come after آن تحول instead of earlier in the sentence?

The word را must immediately follow the specific direct object of the verb. The thing that wasn't believed is آن تحول (that transformation). The earlier noun, این محقق (this researcher), is part of the prepositional phrase with جز and is not the object receiving the action.