Die Kündigungsfrist endet in zwei Monaten, deshalb suchen wir jetzt schon einen Nachmieter.

Kündigungsfrist is a feminine noun, so it takes die in the nominative singular.

• die Frist = deadline / notice period
• die Kündigung = termination / notice of cancellation
• die Kündigungsfrist = notice period

German compound nouns usually take the gender of the last part of the compound. Since Frist is feminine, Kündigungsfrist is feminine too.

Yes. Kündigungsfrist is a compound noun:

• Kündigung = termination, cancellation, notice
• Frist = period, deadline

Together, Kündigungsfrist means the period of notice before something officially ends, often a rental contract or job contract.

This kind of noun-building is very common in German.

In zwei Monaten means in two months.

Here, in is used to talk about a point in the future:

• in einer Woche = in a week
• in drei Tagen = in three days
• in zwei Monaten = in two months

So Die Kündigungsfrist endet in zwei Monaten means the notice period will end two months from now.

Because it is dative plural.

The preposition in here takes the dative when it expresses time in the future. The plural noun Monate becomes Monaten in the dative plural.

• nominative plural: die Monate
• dative plural: den Monaten

After a number, you usually do not see the article, but the noun still shows the case:

• in zwei Monaten
• nach drei Tagen
• seit vielen Jahren

A very common rule: in the dative plural, many nouns add -n if they do not already end in -n or -s.

Because with numbers, German often omits the article unless it is specifically needed.

So you say:

• in zwei Monaten
• vor drei Wochen
• nach fünf Tagen

not usually:

• in den zwei Monaten unless you mean in those two specific months

So here in zwei Monaten simply means in two months in a general sense.

Because deshalb takes the first position in the clause, and in a German main clause the conjugated verb must be in second position.

So the structure is:

• deshalb = position 1
• suchen = position 2
• wir = then the subject

That gives:

• Deshalb suchen wir ...

This is a very important German word order rule. Compare:

• Wir suchen jetzt schon einen Nachmieter.
• Deshalb suchen wir jetzt schon einen Nachmieter.

When something other than the subject comes first, the verb still stays in second position.

Not exactly. Deshalb is an adverb, not a subordinating conjunction.

That matters because it does not send the verb to the end.

Compare:

• ..., deshalb suchen wir jetzt schon einen Nachmieter.
• ..., weil die Kündigungsfrist in zwei Monaten endet.

With deshalb, the clause is a normal main clause, so the verb is in second position. With weil, the verb goes to the end.

Because the sentence contains two main clauses:

1. Die Kündigungsfrist endet in zwei Monaten
2. deshalb suchen wir jetzt schon einen Nachmieter

The comma separates these two clauses. In German, when a word like deshalb, darum, or deswegen links two independent thoughts, a comma is commonly used.

You could also split them into two sentences:

• Die Kündigungsfrist endet in zwei Monaten. Deshalb suchen wir jetzt schon einen Nachmieter.

Here schon means something like already.

• jetzt = now
• schon = already

Together, jetzt schon gives the idea of already now or as early as now.

So the nuance is: we are looking for a new tenant already, even though the notice period still ends only in two months.

It often sounds more natural in English as:

• we’re already looking now
• we’re starting to look already
• we’re looking already, even now

Because Nachmieter is masculine, and it is the direct object of suchen.

• nominative: der Nachmieter
• accusative: den Nachmieter
• with ein- words: ein Nachmieter → einen Nachmieter

So:

• wir suchen einen Nachmieter = we are looking for a new/subsequent tenant

The verb suchen takes the accusative object.

A Nachmieter is the person who takes over a rental place after the current tenant leaves.

It is another compound noun:

• nach- = after / following
• Mieter = tenant

So literally it is something like following tenant or successor tenant.

If you wanted the feminine form, you would say:

• die Nachmieterin

If you mean tenants in general or mixed gender plural:

• die Nachmieter

Because German often uses the present tense to talk about the future when the context is clear.

Here the time reference is already clear because of jetzt schon and in zwei Monaten.

So German naturally says:

• Die Kündigungsfrist endet in zwei Monaten
• deshalb suchen wir jetzt schon einen Nachmieter

Even though part of the meaning refers to the future, the present tense sounds normal and natural. German does this very often.

Yes. That is also grammatical.

Compare:

• Deshalb suchen wir jetzt schon einen Nachmieter.
• Wir suchen deshalb jetzt schon einen Nachmieter.

The difference is mainly emphasis.

• Starting with deshalb emphasizes the consequence: therefore
• Starting with wir emphasizes the subject: we

German lets you move elements around, but the verb still stays in second position in a main clause.

It has two parts:

1. Die Kündigungsfrist endet in zwei Monaten

   • subject: Die Kündigungsfrist
   • verb: endet
   • time expression: in zwei Monaten

2. deshalb suchen wir jetzt schon einen Nachmieter

   • linking adverb: deshalb
   • verb: suchen
   • subject: wir
   • adverbial expression: jetzt schon
   • object: einen Nachmieter

So the sentence pattern is basically:

[statement], therefore [main clause with verb second].