Learn Farsi: این رویکرد بد است، مگر اینکه پیامدهای آن را کنترل کنیم. - This approach is bad, unless we manage its consequences.

The phrase مگر اینکه (unless) introduces a condition or a hypothetical scenario. In Farsi, clauses that follow مگر اینکه always take the subjunctive mood because they describe an action that depends on a condition and isn't a stated fact yet.

Why doesn't the subjunctive verb have the usual بـ (be-) prefix?

The verb here is a compound verb: کنترل کردن (to control / to manage). When forming the subjunctive with compound verbs that use کردن, it is very common to drop the بـ prefix on the conjugated part. So, کنترل کنیم is standard and much more natural than کنترل بکنیم.

Let's look at پیامدهای آن را. Why does the object marker را appear after آن instead of right after the noun?

The word را must follow the entire noun phrase that makes up the specific direct object. Here, the complete object is "its consequences", which is built with an ezâfe: پیامد (consequence) + ها (plural suffix) + ی (ezâfe) + آن (it/that). Therefore, را comes at the very end of that chain.

Could I just say مگر instead of مگر اینکه in this sentence?

No, because you are introducing a full clause with a conjugated verb ("we manage"). مگر اینکه acts as a conjunction connecting two full clauses. If you use alone, it typically acts as a preposition meaning "except" (followed directly by a noun) or as a question particle to express surprise or doubt.