tiimu no syouri ni kanpaisita.

It is read:

チーム の しょうり に かんぱいした。
Or without the spaces, as Japanese is normally written:

チームの勝利に乾杯した。

Word readings:

• チーム = ちーむ = team
• 勝利 = しょうり = victory
• 乾杯した = かんぱいした = toasted / made a toast

の links two nouns.

Here, チームの勝利 means the team’s victory or the victory of the team.

So:

• チーム = team
• 勝利 = victory
• チームの勝利 = the team’s victory

This use of の is very common in Japanese for possession or association.

In this sentence, に marks the target of the toast.

So 勝利に乾杯した means toasted to the victory.

With 乾杯する, Japanese often uses に to show what someone is drinking or toasting to:

• 成功に乾杯する = toast to success
• 新婚夫婦に乾杯する = toast to the newlyweds
• チームの勝利に乾杯した = toasted to the team’s victory

So this に is not a location marker here. It means something more like to in drink to or toast to.

乾杯した is the past form of 乾杯する.

乾杯する means:

• to make a toast
• to drink a toast
• to say cheers

So 乾杯した means:

• made a toast
• toasted
• sometimes said cheers, depending on context

In this sentence, toasted the team’s victory or drank to the team’s victory is the most natural meaning.

Because the sentence is in the past tense.

• 乾杯する = toast / to make a toast
• 乾杯した = toasted / made a toast

So the sentence describes something that already happened.

The subject is omitted, which is very common in Japanese.

Japanese often leaves out information that is understood from context. So this sentence does not explicitly say who made the toast.

Depending on context, it could mean:

• We toasted the team’s victory
• They toasted the team’s victory
• He/She toasted the team’s victory
• simply A toast was made to the team’s victory

In English, you usually need a subject. In Japanese, you often do not.

Because 乾杯する does not usually take the thing being toasted with を.

Instead, Japanese commonly says:

• 〜に乾杯する = toast to 〜

So:

• チームの勝利に乾杯した = toasted to the team’s victory

The important pattern to remember is:

Noun + に + 乾杯する

not usually

Noun + を + 乾杯する

It is plain style, not polite style.

• 乾杯した。 = plain past
• 乾杯しました。 = polite past

So this version sounds like:

• a casual statement
• a narrative sentence
• something you might see in a story, diary, or informal conversation

If you wanted to say it politely, you could say:

チームの勝利に乾杯しました。

Yes, but the nuance changes a little.

• 勝利 is a compact noun meaning victory
• 勝ったこと means the fact of having won

So:

• チームの勝利に乾杯した sounds natural and concise
• チームが勝ったことに乾杯した is understandable, but less elegant and less typical for this kind of toast

For a formal or set phrase like a toast, 勝利 is the more natural choice.

Japanese word order is somewhat flexible, but this sentence is already in a very natural order:

チームの勝利に乾杯した。

That is:

1. the thing being toasted to
2. the verb

You could move things around in some contexts, but this version is the most straightforward and natural.

A good basic pattern is:

[thing/person being toasted to] に 乾杯した

No. Japanese is normally written without spaces.

So the standard written form is:

チームの勝利に乾杯した。

Spaces are often added only in learning materials to make the sentence easier to read.

It can be both.

• As a noun or verbal noun, 乾杯 means a toast
• As an expression, 乾杯！ means Cheers!

Examples:

• みんなで乾杯した。 = We all made a toast.
• 乾杯！ = Cheers!

In your sentence, 乾杯した is the verb phrase, so it means made a toast / toasted.