Ich setze mein Headset auf, damit ich im Großraumbüro alles besser verstehe.

Because aufsetzen is a separable verb.

• The full verb is aufsetzen
• In a normal main clause, it splits:
  • Ich setze mein Headset auf.

This is very common in German:

• Ich mache das Licht an.
• Er steht früh auf.

But in forms where the verb does not split, you get:

• Ich will mein Headset aufsetzen.
• ..., weil ich mein Headset aufsetze.

So in your sentence, setze ... auf is just the split form of aufsetzen.

Because Headset is neuter in German: das Headset.

Here it is the direct object of aufsetzen, so it takes the accusative case. For a neuter noun, the possessive determiner mein stays mein in the accusative:

• nominative: mein Headset
• accusative: mein Headset

Compare that with a masculine noun:

• der Hut → ich setze meinen Hut auf

So:

• Ich setze mein Headset auf. ✅
• Ich setze meinen Headset auf. ❌

Here, aufsetzen means to put on something that you wear on your head, especially:

• glasses
• a hat
• headphones / a headset

So:

• eine Brille aufsetzen = to put on glasses
• einen Hut aufsetzen = to put on a hat
• ein Headset aufsetzen = to put on a headset

It focuses on the action of putting it on, not the state of already wearing it.

A useful contrast:

• Ich setze mein Headset auf. = I put my headset on.
• Ich trage mein Headset. = I am wearing my headset.

Damit introduces a purpose clause. It means so that or in order that.

So:

• Ich setze mein Headset auf, damit ich ... besser verstehe. = I put on my headset so that I can understand everything better.

This tells you the goal or intention behind the action.

A common comparison:

• weil = because
• damit = so that

Compare:

• Ich setze mein Headset auf, weil es laut ist. = I put on my headset because it is loud.
  (reason)

• Ich setze mein Headset auf, damit ich alles besser verstehe. = I put on my headset so that I understand everything better.
  (purpose)

Because damit starts a subordinate clause, and in German subordinate clauses the conjugated verb goes to the end.

Main clause:

• Ich setze mein Headset auf

Subordinate clause:

• damit ich im Großraumbüro alles besser verstehe

That final verb position is one of the most important German word-order rules.

More examples:

• ..., weil ich müde bin
• ..., dass er heute kommt
• ..., wenn wir Zeit haben

So verstehe is at the end because it belongs to a clause introduced by damit.

Im is a contraction of in dem:

• in dem → im

So:

• im Großraumbüro = in the open-plan office

The noun is das Großraumbüro, so after in dem, it becomes:

• in dem Großraumbüro
• usually contracted to im Großraumbüro

Because in can take either the accusative or the dative, depending on meaning.

• accusative = movement into somewhere
• dative = location, being somewhere

Here, im Großraumbüro describes a location: the understanding happens in the open-plan office. There is no movement into it in this part of the sentence.

So German uses the dative:

• im Großraumbüro = in dem Großraumbüro

Compare:

• Ich gehe in das Großraumbüro. = I go into the open-plan office.
  (movement → accusative)

• Ich bin im Großraumbüro. = I am in the open-plan office.
  (location → dative)

Alles means everything.

So alles besser verstehen literally means to understand everything better.

In context, verstehen often means understanding what people are saying, so the sentence suggests something like hearing or following speech more clearly in the office.

Word by word:

• alles = everything
• besser = better
• verstehe = understand

German often uses verstehen where English might sometimes say hear or follow, depending on context.

Because besser is an adverb here, modifying the verb verstehe.

It tells you how the speaker understands:

• alles besser verstehen = to understand everything better

This is a very normal placement in German. Adverbs often appear before the final verb in subordinate clauses.

Compare:

• ..., weil ich Deutsch gut spreche
• ..., damit wir ihn besser hören
• ..., dass sie das schnell lernt

So besser is naturally placed before the verb at the end.

Yes. German allows that.

You can say:

• Damit ich im Großraumbüro alles besser verstehe, setze ich mein Headset auf.

This means the same thing, but the emphasis is slightly different: the purpose comes first.

Notice what happens in the main clause after the subordinate clause:

• ..., setze ich mein Headset auf
• not ..., ich setze mein Headset auf

That is because in a German main clause, the conjugated verb still has to stay in second position.

It is a compound noun, which is extremely common in German.

It is made up of:

• groß = large
• Raum = room/space
• Büro = office

Together, Großraumbüro means open-plan office.

German often combines several words into one noun instead of using separate words like English does.

Other examples:

• Bahnhof = train station
• Kühlschranktür = refrigerator door
• Arbeitszimmer = study / home office

Because they are nouns, and in German all nouns are capitalized.

So in this sentence:

• Headset = noun
• Großraumbüro = noun

That is why they begin with capital letters.

This is one of the easiest visual clues in German for spotting nouns.

It is a loanword from English, but it is commonly used in German.

German often borrows technology-related words from English, for example:

• das Headset
• das Smartphone
• der Laptop

Even though the word comes from English, it still behaves like a normal German noun:

• it has a gender: das Headset
• it takes case endings through articles/determiners:
  • mein Headset
  • mit dem Headset

So yes, it is perfectly normal German usage.