byouin ha kare no sibou wo kakuninsimasita.

The sentence follows this pattern:

病院 は / 彼 の 死亡 を / 確認しました

So the structure is:

• 病院は = as for the hospital / the hospital
• 彼の死亡を = his death
• 確認しました = confirmed

A natural breakdown is:

• Topic: 病院は
• Object: 彼の死亡を
• Verb: 確認しました

Japanese often puts the verb at the end, so the sentence literally feels like:

As for the hospital, his death confirmed.

In natural English, that becomes:

The hospital confirmed his death.

は marks the topic of the sentence, while が more strongly marks the grammatical subject or introduces new information.

So:

• 病院は彼の死亡を確認しました。
  = As for the hospital, it confirmed his death.

This sounds neutral and natural if the hospital is already the thing being talked about, or if the speaker is simply presenting it as the topic.

If you used が:

• 病院が彼の死亡を確認しました。

that would put more focus on the hospital as the one that did the confirming, perhaps contrasting it with someone else.

In many contexts, both are possible, but は often sounds smoother in plain narration.

彼の死亡 means his death.

Here:

• 彼 = he / him
• の = links one noun to another
• 死亡 = death, decease

So 彼の死亡 is a noun phrase meaning:

• the death of him
• more naturally, his death

The particle の often works like English of or the possessive ’s.

Examples:

• 私の本 = my book
• 日本の文化 = Japanese culture / the culture of Japan
• 彼の死亡 = his death

This is mainly about style and formality.

• 彼が死んだ = he died
  This is a full clause and sounds more direct and less formal.
• 彼の死亡 = his death
  This is a noun phrase and sounds more formal, official, and impersonal.

Because 確認する often takes a noun as its object, 彼の死亡を確認しました sounds very natural in formal contexts like:

• hospitals
• police reports
• news reports
• official announcements

A more conversational sentence might be:

• 病院は彼が亡くなったことを確認しました。
• 病院は彼が死んだことを確認しました。

But 彼の死亡を確認しました is especially typical in formal writing.

They are related, but not exactly the same.

• 死亡 is a formal word meaning death, decease, or passing away in an official sense.
• 死 is a more general or abstract word for death.

In this sentence, 死亡 is preferred because it matches the formal tone of 確認しました and the institutional subject 病院.

You would commonly see 死亡 in:

• medical contexts
• legal documents
• news reports
• official announcements

So 彼の死を確認しました is understandable, but 彼の死亡を確認しました sounds more natural in this formal setting.

を marks the direct object of the verb.

The verb here is 確認しました = confirmed.

What did the hospital confirm?

彼の死亡 = his death

So:

• 彼の死亡を確認しました
• confirmed his death

This is a very common pattern:

• 予定を確認する = confirm the schedule
• 事実を確認する = confirm the facts
• 安全を確認する = confirm safety

確認しました is the polite past form of 確認する, which means:

• to confirm
• to verify
• to check and establish as true

It is built like this:

• 確認 = confirmation
• する = to do
• 確認する = to confirm
• 確認しました = confirmed

This is a very common kind of Japanese verb: a noun + する.

Other examples:

• 勉強する = to study
• 連絡する = to contact
• 説明する = to explain

So 確認しました is simply the polite past: confirmed.

Because the act of confirmation already happened.

• 確認します = confirms / will confirm
• 確認しました = confirmed

So the sentence is reporting a completed event:

The hospital confirmed his death.

Even if the death itself happened earlier, the tense here is specifically about the hospital’s act of confirming it.

Yes, this is very normal in both Japanese and English.

Just like English says:

• The hospital confirmed his death
• The police announced it
• The school decided...

Japanese also often uses an institution as the acting entity, even though the actual action was done by people in that institution.

So 病院 here means something like:

• the hospital
• the hospital staff
• the medical team at the hospital

This is completely natural.

It is read:

びょういん は かれ の しぼう を かくにんしました。

In romaji:

byouin wa kare no shibou o kakunin shimashita

A few notes:

• 病院 = びょういん
• 彼 = かれ
• 死亡 = しぼう
• 確認 = かくにん
• を is written を but pronounced o
• は is written は but pronounced wa when used as a particle

Yes, it is natural, but it sounds formal and official.

It fits contexts like:

• medical statements
• hospital reports
• news reports
• police or legal reporting
• formal written Japanese

It would sound less natural in casual everyday conversation. In a more conversational style, someone might say something softer or less official.

So this sentence has a clear institutional and formal tone.

Yes, very often Japanese leaves out information that is clear from context.

For example, if everyone already knows who the person is, you might see:

• 病院は死亡を確認しました。

However, this can sound a little incomplete unless the context makes the identity obvious. In many formal reports, the person is named or otherwise specified, so 彼の死亡 helps make the sentence clear.

Japanese omits subjects and other elements much more freely than English, but only when the context supports it.