watasitati ha deeta wo bunsekisuru.

は marks the topic of the sentence. In 私たちはデータを分析する, 私たち is the topic: as for us / we.

A very literal breakdown is:

• 私たち = we
• は = topic marker
• データ = data
• を = object marker
• 分析する = analyze

So the structure is something like: As for us, data [we] analyze.

Also, although は is written with the hiragana ha, when it is used as a particle, it is pronounced wa.

を marks the direct object of the verb—the thing that receives the action.

Here:

• データを = data as the thing being analyzed
• 分析する = to analyze

So を tells you that データ is what we analyze.

A common pronunciation note: the particle を is usually pronounced o in modern Japanese.

Japanese normally places the main verb at the end of the sentence. That is one of the most basic word-order patterns in Japanese.

So:

• 私たちは = as for us
• データを = data
• 分析する = analyze

This is a very typical Japanese order: topic + object + verb.

English usually says We analyze data, but Japanese tends to build the sentence and then finish with the action.

分析する is the plain form (also called the dictionary form) of the verb.

It is built from:

• 分析 = analysis
• する = to do

Together, 分析する literally means to do analysis, which in natural English is to analyze.

This pattern is very common in Japanese: a noun plus する becomes a verb.

Examples:

• 勉強する = to study
• 運動する = to exercise
• 研究する = to research

So 分析する is a very standard noun + する verb.

This is normal in Japanese.

• 分析 is the main lexical part, written in kanji
• する is the verb part, usually written in hiragana

So Japanese often mixes writing systems inside one word or expression.

The reading is:

• 分析する = ぶんせきする

This kind of mixed writing is extremely common with する-verbs.

It can often be omitted.

Japanese frequently leaves out subjects or topics when they are clear from context. So in many situations, a speaker could simply say:

• データを分析する。

That can still mean We analyze data, I analyze data, or even (someone) analyzes data, depending on context.

Using 私たち makes it explicit that the topic is we/us.

Yes, but the nuance changes.

• 私たちはデータを分析する。 = As for us, we analyze data.
• 私たちがデータを分析する。 = We are the ones who analyze the data.

Very roughly:

• は presents a topic, often with a broader or more neutral feel
• が can sound more specific, contrastive, or focused on who is doing the action

For beginners, は is the more straightforward choice in a basic statement like this.

Because データ is a loanword, originally from English data.

Katakana is commonly used for:

• foreign loanwords
• some technical terms
• emphasis
• onomatopoeia in many cases

So データ in katakana is exactly what you would expect.

Japanese 分析する is a non-past form, not just a strict present tense.

Depending on context, it can mean:

• analyze
• will analyze
• do analyze

So this form can refer to:

• a habitual action
• a general statement
• a future action

Japanese relies heavily on context for time reference.

The polite version is:

• 私たちはデータを分析します。

Here, 分析する becomes 分析します.

So:

• 分析する = plain
• 分析します = polite

The plain form is common in dictionaries, casual speech, and many written styles. The polite form is used in formal conversation and polite everyday speech.

They are probably added only for learners.

Japanese is normally written without spaces, so the natural written sentence is:

• 私たちはデータを分析する。

Textbooks and beginner materials sometimes insert spaces to make the structure easier to see, but standard Japanese writing does not usually do that.