El boletín de denuncia identifica al agente denunciante.

Because al is the required contraction of a + el in Spanish.

• a = the personal a or the preposition to
• el = the
• a el becomes al

So:

• identifica al agente = identifies the officer

This contraction is mandatory, except with the article in some proper names, such as a El Escorial.

This is because of the personal a.

In Spanish, when the direct object is a specific person or person-like being, it usually takes a. Here, el agente denunciante refers to a specific person, so Spanish uses:

• identifica al agente denunciante

Compare:

• Identifica al conductor = It identifies the driver.
• Identifica el vehículo = It identifies the vehicle.

The second one has no personal a because el vehículo is not a person.

Not exactly. Although boletín is related to bulletin, in this legal/administrative context it usually means a form, report, notice, or ticket/document.

So el boletín de denuncia is not a public bulletin board notice. It is more like:

• a penalty notice
• a report form
• an offence notice
• a citation document

The exact English translation depends on the context, but grammatically in Spanish it is simply the subject of the sentence.

De denuncia means something like of complaint/report/offence depending on context.

In legal or police language, denuncia often means:

• a formal complaint
• a report of an offence
• an accusation/report submitted to the authorities

So boletín de denuncia is a fixed administrative expression: a document connected with reporting an offence or issuing a complaint/report.

Here, de links the two nouns, much like English of or sometimes a noun modifier:

• boletín de denuncia = complaint/report notice or offence report form

Because in Spanish, adjectives usually come after the noun.

So:

• agente denunciante = reporting/complaining officer

Here denunciante is functioning like an adjective or descriptive label attached to agente.

This is very common in formal Spanish:

• autor responsable
• órgano competente
• persona interesada

Putting it before the noun would sound unusual here and would not be the normal legal style.

It can be both, depending on context.

In this sentence, denunciante describes agente, so it works like an adjective:

• el agente denunciante = the reporting/offending-reporting officer

But denunciante can also be a noun on its own:

• El denunciante no compareció. = The complainant/reporting person did not appear.

This is common in Spanish: some participle-like or agent nouns can function either as nouns or adjectives.

They are related, but they are different kinds of words.

• denuncia = a noun, meaning a complaint, report, or accusation
• denunciante = a person who reports/complains, or something describing that person

So:

• boletín de denuncia = notice/form of complaint/report
• agente denunciante = the officer who makes the report or files the complaint

A useful way to remember it:

• -a here gives you the thing: denuncia
• -ante often refers to the one doing the action: denunciante

Because the subject is singular:

• El boletín de denuncia = the complaint/report form

That whole phrase is one singular noun phrase, so the verb must also be singular:

• identifica

If the subject were plural, the verb would change:

• Los boletines de denuncia identifican al agente denunciante.

Spanish generally uses articles more regularly than English.

In this sentence:

• El boletín = the document being talked about
• al agente denunciante = the specific officer being identified

English might sometimes say something like The notice identifies the reporting officer, which also uses articles, but in other situations English may omit them where Spanish keeps them.

In formal Spanish, using the article often sounds natural and necessary, especially with specific nouns like:

• el agente
• la denuncia
• el conductor

Yes. In administrative or legal Spanish, identificar can mean:

• to identify
• to state the identity of
• to indicate who someone is
• to record the details of

So in this sentence, it may not mean that the document somehow recognizes the officer visually. It more likely means that the form records or specifies which officer made the report.

That is a common feature of formal Spanish: verbs may sound simple, but in context they have a more procedural meaning.

Yes, very much so.

Several things make it sound formal/administrative:

• boletín
• denuncia
• agente denunciante
• the precise, impersonal wording

In everyday conversation, a speaker might choose simpler wording. But in official Spanish from Spain, this kind of phrase is very normal in police, traffic, or legal documents.

So this is a useful example of bureaucratic Spanish, not casual conversation.

In general Spanish, agente can mean agent in several senses. But in this context, especially with boletín de denuncia, it most likely refers to an officer or law-enforcement agent, often a police or traffic officer.

So while the literal word is agent, the natural interpretation in this sentence is usually:

• the reporting officer
• the officer issuing the report

Context is what tells you that.

Yes, but the original order is the most neutral and official-sounding.

For example, Spanish could also say:

• El boletín de denuncia al agente denunciante lo identifica.

But that sounds marked, less natural here, and stylistically worse for an official document.

The standard order is:

• subject: El boletín de denuncia
• verb: identifica
• object: al agente denunciante

That straightforward order is especially common in formal writing.