Hvis en trøje er hullet eller har en stor plet, er den ofte for ødelagt til at give videre.

Because Danish main clauses follow the verb-second (V2) rule.

Here, the first part Hvis en trøje er hullet eller har en stor plet is a subordinate clause introduced by hvis (if). When that whole clause comes first, the main clause starts after the comma, and the finite verb must come before the subject:

• ..., er den ofte ...

not

• ..., den er ofte ...

So the pattern is:

• Hvis ... , er den ...

This is very common in Danish:

• Hvis det regner, bliver jeg hjemme.
• Når jeg har tid, læser jeg.

In English, we would usually keep normal word order after the comma, but Danish does not.

Hullet means full of holes, holey, or with holes in it.

It comes from the noun hul, which means hole. As an adjective, hullet is commonly used about clothes or fabric that have one or more holes.

So:

• en hullet trøje = a sweater with holes
• Trøjen er hullet = The sweater has holes / is holey

It is not exactly the same as English holy, of course — it means physically damaged by holes.

Because trøje is a common-gender noun in Danish, and the pronoun for a singular common-gender noun is den.

• en trøje = a sweater
• den = it referring back to that sweater

So:

• Hvis en trøje ... , er den ofte ...
• If a sweater ... , it is often ...

If the noun were a neuter noun, Danish would usually use det instead.

Plet means spot, stain, or mark, depending on context.

In this sentence, en stor plet most naturally means a big stain on the sweater.

Examples:

• en plet på skjorten = a stain on the shirt
• Der er en plet her. = There is a stain/spot here.

So har en stor plet means has a large stain.

This is the Danish equivalent of too damaged to pass on / give away.

The pattern is:

• for + adjective + til at + infinitive

So here:

• for ødelagt = too damaged
• til at give videre = to pass on / give away

Together:

• for ødelagt til at give videre = too damaged to pass on

This is a very useful structure in Danish:

• for dyr til at købe = too expensive to buy
• for træt til at arbejde = too tired to work

Because after for + adjective + til, Danish normally uses at + infinitive.

So:

• for ødelagt til at give videre
• for tung til at løfte
• for svær til at forstå

This is similar to English too ... to ..., but Danish keeps at before the infinitive.

So you should think of the full pattern as:

• for X til at Y

Give videre literally means give further/onward, but in natural English it often means:

• pass on
• give away
• hand on
• sometimes donate

In this sentence, it means something like giving the sweater to someone else instead of keeping it.

So the idea is:

• if the sweater has holes or a big stain, it is often too damaged to be given to another person

The exact English translation depends on context, but pass on or give away fits well here.

They are related, but not identical.

• hullet specifically means having holes
• ødelagt means damaged, broken, or ruined more generally

So the sentence says:

• if a sweater is holey or has a big stain,
• then it is often too damaged to pass on

In other words, hullet and har en stor plet give specific examples of damage, while ødelagt summarizes the overall condition.

Both are possible in Danish, but they are slightly different in feel.

• har en stor plet = has a big stain
• er plettet = is stained / stain-marked

The version in your sentence is more concrete: it points to one large stain.

If you said:

• Hvis en trøje er plettet ...

that would mean something more like:

• If a sweater is stained

So the original sentence is just a bit more specific.

Because in Danish main clauses, the finite verb usually comes first in this kind of structure, then the subject, and adverbs like ofte often come after the subject.

So:

• er = finite verb
• den = subject
• ofte = adverb

That gives:

• er den ofte for ødelagt ...

This word order is very normal in Danish.

Compare:

• I dag køber jeg ofte brød.
• Når jeg er træt, drikker jeg ofte kaffe.

Usually hvis means if, not when.

So:

• Hvis en trøje er hullet ... = If a sweater has holes ...

If you wanted when, Danish would more often use når:

• Når en trøje er hullet ...

The difference is similar to English:

• if = conditional, maybe the situation happens
• when = more like whenever/once it happens

In some contexts, English may translate a Danish hvis sentence quite naturally with when, but the basic meaning of hvis is still if.