atarasii busyo ni haitta node, douryou no meisi wo minagara namae wo oboetai desu.

A natural reading is:

あたらしい ぶしょ に はいった ので、どうりょう の めいし を みながら なまえ を おぼえたい です。

Word readings:

• 新しい → あたらしい
• 部署 → ぶしょ
• 入った → はいった
• 同僚 → どうりょう
• 名刺 → めいし
• 見ながら → みながら
• 名前 → なまえ
• 覚えたい → おぼえたい

に marks the destination or place one enters.

So:

• 部署に入る = to join / enter a department

Even though English often says join a department or be assigned to a department, Japanese commonly uses 入る with に.

Similar patterns:

• 会社に入る = join a company
• 部屋に入る = enter a room
• 大学に入る = enter a university

In this sentence, 新しい部署に入った means the speaker has entered or joined a new department.

Because the speaker is talking about something that already happened:

• 新しい部署に入ったので = because I joined / entered a new department

The joining happened first, and as a result, the speaker now wants to learn people’s names.

If it were non-past:

• 新しい部署に入るので
  this would mean because I am going to join a new department or because I will be joining a new department

So 入った shows the speaker is already in that new department.

ので means because or since.

• 新しい部署に入ったので = because I joined a new department

Compared with から, ので usually sounds:

• a little softer
• a little more explanatory
• a little more formal/polite

So:

• 入ったので、名前を覚えたいです。
• 入ったから、名前を覚えたいです。

Both are possible, but ので fits very naturally in a polite statement like this.

A rough nuance:

• から can sound more direct
• ので can sound more neutral or gentle

〜ながら means while doing something.

It attaches to the ます-stem of a verb:

• 見る → 見 → 見ながら
• 食べる → 食べ → 食べながら
• 聞く → 聞き → 聞きながら

So:

• 名刺を見ながら名前を覚えたいです = I want to learn/memorize names while looking at business cards

This means the speaker wants to use the business cards as a support while memorizing the names.

Because の shows possession or relationship.

• 同僚の名刺 = my colleagues’ business cards / the business cards of my colleagues

Here:

• 同僚 = colleague(s)
• 名刺 = business card(s)

So 同僚の名刺 means the cards belonging to or associated with the colleagues.

Then を marks the direct object of 見る:

• 同僚の名刺を見ながら = while looking at my colleagues’ business cards

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

In this sentence, the meaning naturally implies:

• I joined a new department
• I want to remember names

So the subject I is understood and does not need to be stated.

A fuller version could be:

• 私は新しい部署に入ったので、同僚の名刺を見ながら名前を覚えたいです。

But in normal Japanese, leaving out 私は is very common.

覚える can mean:

• to memorize
• to learn
• to remember

In this sentence, the nuance is close to:

• I want to learn everyone’s names
• I want to memorize their names
• I want to get their names down

Because the speaker is new in the department, 覚えたい suggests an active effort to learn the names, not just recalling something already known.

So memorize/learn is usually the best fit here.

Because 覚える normally takes a direct object with を.

• 名前を覚える = to remember/memorize names

So:

• 名前を覚えたいです = I want to remember/learn the names

Using が here would be unnatural in standard Japanese for this meaning.

A useful pattern to remember:

• 日本語を覚える = learn Japanese
• 電話番号を覚える = memorize a phone number
• 人の名前を覚える = remember someone’s name

〜たい expresses want to do something, and adding です makes it polite.

• 覚えたい = want to remember
• 覚えたいです = want to remember (polite)

This is a very common polite pattern in everyday Japanese.

Compare:

• 名前を覚えたい。 = plain/casual
• 名前を覚えたいです。 = polite

So the sentence ends politely because the speaker is making a polite statement.

Literally, yes, 入る means enter. But in a workplace context, 部署に入る often means:

• join a department
• be assigned to a department
• start working in a department

So it does not necessarily mean physically walking into a room. It usually refers to becoming part of that department organizationally.

That is why 新しい部署に入った is best understood as:

• I joined a new department or
• I was assigned to a new department

Because 新しい is an i-adjective, and i-adjectives directly modify nouns.

• 新しい部署 = a new department

No particle is needed between them.

Other examples:

• 大きい会社 = a big company
• 忙しい人 = a busy person
• 難しい名前 = a difficult name

So 新しい部署 is just a normal adjective + noun combination.

Yes. In Japanese, a noun like 名前 can be singular or plural depending on context.

Here, because the speaker mentions 同僚 and business cards, the meaning is naturally:

• the names of my colleagues
• in other words, everyone’s names

Japanese often does not mark plural explicitly when the context already makes it clear.

So although the sentence says 名前, the meaning can easily be names in English.

名刺 means business card.

In Japanese business culture, business cards are very important. When meeting new coworkers or business contacts, people often exchange them. A business card usually shows:

• the person’s name
• company
• department
• position

So 同僚の名刺を見ながら名前を覚えたいです feels very natural in a workplace setting: the speaker wants to look at coworkers’ business cards in order to learn their names.

Yes. A more natural English rendering might be:

• Since I’ve joined a new department, I want to learn my coworkers’ names while looking at their business cards.
• Because I’m in a new department, I want to memorize my colleagues’ names by looking at their business cards.
• I’ve joined a new department, so I want to learn everyone’s names with the help of my coworkers’ business cards.

A very literal translation is useful for study, but natural English often smooths out details like omitted subjects and singular/plural nouns.