Gangen bliver hurtigt rodet, hvis ingen sætter kosten på plads og tømmer spanden efter rengøringen.

Because Danish usually marks the by adding it to the end of the noun.

• en gang = a hallway / corridor
• gangen = the hallway / corridor

So gangen is the definite singular form. Here it means the specific hallway being talked about.

Bliver means becomes / gets, while er means is.

So:

• Gangen er rodet = the hallway is messy
• Gangen bliver rodet = the hallway gets / becomes messy

In this sentence, bliver shows a change of state: the hallway is not just messy; it quickly becomes messy.

Here hurtigt is an adverb, meaning quickly.

The adjective is:

• hurtig = quick

The adverb is often formed with -t:

• hurtigt = quickly

It modifies the whole idea of bliver rodet:

• bliver hurtigt rodet = gets messy quickly

Here rodet is an adjective meaning messy / cluttered / untidy.

It is used after bliver, so it is a predicative adjective:

• gangen bliver rodet

That is the same kind of structure as:

• han bliver træt = he gets tired
• værelset bliver beskidt = the room gets dirty

Even if rodet looks like a past participle, in this sentence it is best understood simply as an adjective.

Ingen means no one / nobody here.

It is the natural negative subject in Danish when you mean that zero people do something:

• Ingen kommer = nobody comes
• Ingen sætter kosten på plads = nobody puts the broom away

A learner may wonder about ikke nogen, but ingen is the normal and most compact choice when no one is the subject.

Because the same subject, ingen, applies to both verbs:

• ingen sætter
• og tømmer

So the sentence works like English if nobody puts the broom away and empties the bucket.

Danish does not need to repeat the subject if it is the same for both coordinated verbs.

Sætte noget på plads is a very common expression meaning put something back where it belongs or put something away properly.

So:

• sætter kosten på plads = puts the broom back in its proper place

Literally, på plads means in place or into its place, but in normal usage it often means back where it should be.

This is why the phrase sounds more natural than a very literal word-for-word interpretation.

Because the sentence refers to identifiable objects in a shared setting: the broom and the bucket.

In Danish, that is usually expressed with the definite ending:

• en kost = a broom

• kosten = the broom

• en spand = a bucket
• spanden = the bucket

This is very natural when the speaker assumes everyone knows which broom and bucket are meant.

Because it refers to a specific cleaning activity: the cleaning that has just taken place or is understood from context.

• rengøring = cleaning
• rengøringen = the cleaning

So efter rengøringen means after the cleaning or, more naturally in English, after cleaning.

The definite form is common when the event is specific and known in the situation.

Hvis means if and introduces a subordinate clause.

In Danish subordinate clauses, the conjunction comes first, and then you normally get:

• hvis + subject + finite verb

So:

• hvis ingen sætter kosten på plads ...

That is standard subordinate-clause order.

A useful thing to remember is that sentence adverbs such as ikke normally come after the finite verb in a subordinate clause:

• hvis han ikke sætter kosten på plads = if he does not put the broom away

You will often see a comma before subordinate clauses like this:

• Gangen bliver hurtigt rodet, hvis ...

That comma is very common in Danish. However, modern Danish allows two comma systems, so depending on the system being used, the comma before hvis may be present or omitted.

So both of these can be accepted:

• Gangen bliver hurtigt rodet, hvis ...
• Gangen bliver hurtigt rodet hvis ...

Many learners will see the comma often, especially in teaching materials and careful writing.