sono gamen wo sukuriinsyottosite, sensei ni okurimasita.

その means that and points to something connected to the listener or something just mentioned in the conversation.

A quick comparison:

• この = this (near the speaker)
• その = that (near the listener / already mentioned)
• あの = that over there (away from both speaker and listener)

So その画面 means that screen.

画面 means screen, display, or sometimes what is shown on the screen.

In this sentence, it refers to the screen being captured. It does not have to mean the physical monitor itself; it often means the visible screen content.

The particle を marks the direct object of the action.

Here, その画面を tells you what is being acted on:

• その画面を = that screen
• スクリーンショットして = screenshotting

So the screen is the thing being screenshotted.

スクリーンショットする is a suru-verb built from the loanword スクリーンショット.

So:

• dictionary form: スクリーンショットする = to take a screenshot
• て-form: スクリーンショットして = take a screenshot and...

This is very common in Japanese: a noun or loanword + する becomes a verb.

Because the sentence has two actions:

1. screenshotting the screen
2. sending it to the teacher

The first verb is put into the て-form to connect it to the next action:

• スクリーンショットして、
• 送りました。

So it means something like:

• I screenshotted that screen and sent it to the teacher.

If you used スクリーンショットしました, it would sound like the sentence ended there unless you added another structure.

Here, the て-form links actions in sequence.

So スクリーンショットして、先生に送りました means:

• I took a screenshot, and then sent it to the teacher.

In many cases, this implies the first action happened before the second one. It does not always emphasize a huge time gap; it just connects the actions naturally.

The particle に marks the recipient of 送る (to send).

So:

• 先生に送りました = sent it to the teacher

This is very common with verbs involving giving, sending, showing, telling, etc.

Examples:

• 友だちに送る = send to a friend
• 先生に見せる = show to the teacher
• 母に言う = say/tell to my mother

Usually, に is the natural choice with 送る when marking the recipient.

• 先生に送りました = natural, standard

へ is more associated with direction, and with a person as the recipient, に is much more common here.

So for a learner, 先生に送る is the form to remember.

送りました is the polite past form of 送る (to send).

Breakdown:

• 送る = plain dictionary form
• 送りました = polite past form

It shows:

• the action is completed
• the speaker is speaking politely

Because 先生 appears in the sentence, using polite style like 送りました is especially natural.

Yes, スクリーンショットする is natural and widely used, especially in modern speech.

Another very common expression is:

• スクリーンショットを撮る

Both are used. Depending on the speaker, device context, and style, one may sound a little more natural than the other, but スクリーンショットして is absolutely normal.

In casual speech, you may also hear:

• スクショする
  where スクショ is a shortened form of スクリーンショット

Japanese word order is more flexible than English because particles show each word’s role.

This sentence is already in a very natural order:

• その画面をスクリーンショットして、先生に送りました。

You can move some parts around, but not everything sounds equally natural. As a beginner, it is safest to keep:

• object + action
• recipient + final verb

Also remember that the main verb usually comes at the end.

The comma shows a pause and helps separate the two actions.

• スクリーンショットして、先生に送りました。

It is not absolutely required every time, but it is very common in writing when a て-form connects longer parts of a sentence. It makes the sentence easier to read.

That’s right: normal Japanese writing usually does not use spaces like this.

A natural version would be:

その画面をスクリーンショットして、先生に送りました。

Spaces are often added in teaching materials to help learners see the word boundaries more clearly. They are not normally written in everyday Japanese.