Een ongegrond bezwaarschrift verandert de beschikking niet.

Ongegrond is an adjective. It literally breaks down as:

• on- = un-
• gegrond = well-founded, justified, based on valid grounds

So ongegrond means unfounded, without valid grounds, or not justified.

In this sentence, it describes bezwaarschrift:

• een ongegrond bezwaarschrift = an unfounded objection/appeal letter

Bezwaarschrift is a compound noun:

• bezwaar = objection
• schrift = writing / written document

So literally it is a written objection.

In legal or administrative Dutch, bezwaarschrift usually means a formal notice of objection submitted against a decision made by an authority.

English learners often expect a more everyday word, but this is fairly official/legal language.

Because Dutch normally uses an article with a singular countable noun when speaking about a/an thing in general.

• een bezwaarschrift = an objection letter
• een ongegrond bezwaarschrift = an unfounded objection letter

Leaving out een would usually sound incomplete here.

Because the subject is de beschikking, or more precisely the whole subject phrase Een ongegrond bezwaarschrift, which is third person singular.

The infinitive is veranderen = to change.

Present tense:

• ik verander
• jij verandert
• hij/zij/het verandert

So:

• Een ongegrond bezwaarschrift verandert ...

That is the normal present tense form.

In a simple main clause, Dutch often places niet after the object when it negates the whole action.

Sentence structure here:

• Een ongegrond bezwaarschrift = subject
• verandert = verb
• de beschikking = object
• niet = not

So:

• Een ongegrond bezwaarschrift verandert de beschikking niet.

This is very natural Dutch word order.

Compare the English order:

• does not change the decision

Dutch does not place niet directly before the main verb in this kind of sentence.

Because beschikking is a de-word in Dutch.

You simply have to learn the noun with its article:

• de beschikking

Many Dutch nouns do not have a predictable gender from the English meaning alone, so learners usually memorize them together:

• de beschikking
• het bezwaarschrift

That also explains:

• een ongegrond bezwaarschrift
• de beschikking

Here, beschikking is being used in a legal/administrative sense.

In official Dutch, beschikking often means:

• a decision
• a formal ruling
• an administrative decision

So in this sentence it does not mean everyday availability or disposal. It is a technical/legal term.

That is important, because official Dutch often uses words that look familiar but have a more specific meaning in context.

It is the subject.

You can tell from the structure:

• Een ongegrond bezwaarschrift = the thing doing the action
• verandert = changes
• de beschikking = the thing being changed
• niet = not

So:

• subject: Een ongegrond bezwaarschrift
• object: de beschikking

English learners sometimes get confused because both nouns have articles, but the word order helps make it clear.

Because this sentence is in the present tense, stating a general fact or rule:

• verandert niet = does not change

If you wanted a past meaning, you might use:

• heeft de beschikking niet veranderd = did not change / has not changed the decision

But here the sentence is describing what an unfounded objection does in general, so the simple present is the natural choice.

Yes.

• bezwaar = the objection itself, the complaint or grounds for objecting
• bezwaarschrift = the written document in which that objection is formally submitted

So:

• bezwaar maken = to object
• een bezwaarschrift indienen = to submit a formal written objection

In legal contexts, the distinction matters.

Actually, it does have the -e ending: ongegrond is the dictionary form, but before bezwaarschrift after een, the form stays ongegrond because of a standard adjective rule with indefinite singular neuter nouns.

Here is the key point:

• bezwaarschrift is a het-word
• with een
  • singular het-word, the adjective often has no -e
• so: een ongegrond bezwaarschrift

Compare:

• het ongegronde bezwaarschrift
  with het, the adjective usually does take -e

So this contrast is useful:

• een ongegrond bezwaarschrift
• het ongegronde bezwaarschrift

A more natural legal/plain-English rendering could be:

• An unfounded objection does not alter the decision.
• An unfounded notice of objection does not change the ruling.
• If the objection is unfounded, the decision remains unchanged.

A very literal translation is helpful for grammar, but in real legal English you would often choose wording that sounds more idiomatic than a strict word-for-word version.