zyougi to hasami wo tukatte, kami wo hanbun ni kirimasita.

と is being used to connect nouns, like and in English.

So:

• 定規とはさみ = a ruler and scissors

This と is specifically for making a complete list. It sounds like these are the items being named together as a set.

Because 定規とはさみ works as one combined noun phrase:

• 定規とはさみ = ruler and scissors

Then that whole phrase is marked by を as the object of 使って:

• 定規とはさみを使って = using a ruler and scissors

Japanese often attaches the particle only once, after the full list or phrase, not after each item.

使って is the て-form of 使う (to use).

In this sentence, the て-form connects actions:

• 定規とはさみを使って、紙を半分に切りました。
• Using a ruler and scissors, [I] cut the paper in half.

So the flow is:

1. use the ruler and scissors
2. cut the paper

This use of the て-form often means and, while, or by doing something.

Here it is close to:

• using ...
• and then ...

Because 紙 is the thing being cut, so it is the direct object of 切りました.

• 紙を切りました = cut the paper

The particle を often marks the direct object of a verb.

In this sentence, there are two を particles because there are two different verbs/actions involved:

• 定規とはさみを使って → use a ruler and scissors
• 紙を半分に切りました → cut the paper in half

半分 means half.

In 半分に切る, the に marks the resulting state:

• 半分に切る = cut into half / cut in half

So the idea is not cut half as a direct object, but rather:

• the paper changes
• the result is that it becomes half / two halves

This pattern is common in Japanese:

• 二つに分ける = divide into two
• 細かく切る = cut finely
• 半分に折る = fold in half

So に here shows what state or form something becomes after the action.

Because 切りました is the main verb of the sentence, and it finishes the statement.

• 使って connects to the next action
• 切りました ends the sentence

So:

• 使って = connecting form
• 切りました = final, polite past form

If you ended with 切って, the sentence would usually feel unfinished unless more came after it.

Japanese often leaves out the subject when it is understood from context.

So this sentence does not explicitly say:

• I cut the paper
• she cut the paper
• they cut the paper

It just says:

• [someone] used a ruler and scissors and cut the paper in half

In real Japanese, this is very normal. If the subject is already clear from the situation, it is usually omitted.

Yes, very often Japanese would also say:

• 定規とはさみで、紙を半分に切りました。

Here, で marks the tools or means:

• with a ruler and scissors
• using a ruler and scissors

This version is shorter and very natural.

The difference is:

• 定規とはさみを使って explicitly says using a ruler and scissors
• 定規とはさみで simply marks them as the tools

Both are correct, but で is often the more direct way to express tools.

In Japanese, はさみ usually refers to scissors as a tool, and it can mean a pair of scissors.

Unlike English, where scissors is grammatically plural, Japanese does not work the same way. A noun like はさみ does not need singular/plural marking in the same way.

So in this sentence:

• はさみ = scissors / a pair of scissors

The exact number is usually understood from context.

The dictionary forms are:

• 使って → 使う = to use
• 切りました → 切る = to cut

And their forms here are:

• 使って = て-form
• 切りました = polite past form

So the basic structure comes from:

• 定規とはさみを使う
• 紙を半分に切る

Yes, the order is natural and meaningful.

The sentence goes like this:

1. 定規とはさみを使って = using a ruler and scissors
2. 紙を = the paper
3. 半分に = in half / into halves
4. 切りました = cut

Japanese usually places details before the main verb, and the verb comes at the end.

So the sentence builds up to the final action:

• Using a ruler and scissors, [I] cut the paper in half.

That is a very normal Japanese sentence pattern.

The spaces are just for learners. Normal Japanese is usually written without spaces:

• 定規とはさみを使って、紙を半分に切りました。

Textbooks and learning materials sometimes add spaces to make it easier to see:

• where one word ends
• which particle goes with which word
• how the sentence is built

So the spaced version is helpful for study, but not standard everyday writing.