Muutoksenhaku alkaa tiedoksiannon jälkeen.

Because it is a compound noun, which is extremely common in Finnish.

• muutos = change
• haku = search, seeking, application

So muutoksenhaku literally means something like seeking a change, and in legal language it means appeal or appeal process.

In Finnish, compounds are normally written as one word, much more often than in English.

This is a very common feature of Finnish compounds: the first part often appears in a form that looks like the genitive singular.

• muutos → muutoksen
• muutoksenhaku

Here, -n is not really being used to mean possession in the usual English sense. It is part of how the compound is formed.

So a learner can think of it like this:

• muutos = change
• muutoksenhaku = change-seeking / appeal

This pattern shows up in many Finnish compounds.

Because jälkeen requires the noun before it to be in the genitive.

So:

• tiedoksianto = notification, service of notice
• tiedoksiannon = genitive singular
• tiedoksiannon jälkeen = after the notification / after service

So the structure is:

[genitive noun] + jälkeen

That is why the sentence does not use the basic dictionary form tiedoksianto here.

Jälkeen is a postposition, meaning a word that comes after the noun phrase it belongs to.

English usually uses prepositions:

• after the notification

Finnish here uses a postposition:

• tiedoksiannon jälkeen
• literally: the notification's after

So the important thing to remember is:

• English: after + noun
• Finnish: noun in genitive + jälkeen

Because the 3rd person singular present tense of many Finnish verbs looks the same as the basic dictionary form.

Here:

• dictionary form: alkaa = to begin, to start
• 3rd person singular: alkaa = begins, starts

Since muutoksenhaku is singular, the verb is also singular:

• Muutoksenhaku alkaa = the appeal begins / the appeal process begins

Compare:

• minä alan = I begin
• hän alkaa = he/she begins

So this is normal Finnish verb conjugation.

Because Finnish does not have articles like a, an, and the.

That means muutoksenhaku can be understood from context as things like:

• the appeal
• an appeal
• appeal proceedings
• the appeal process

The exact English choice depends on context, especially in legal language.

It is often a legal or administrative term.

In everyday English, a translation might be notification. But in legal contexts it can mean something more specific, such as:

• formal notification
• service of notice
• official delivery of a decision or document

So in this sentence, tiedoksianto is not just any casual notice; it likely refers to a formal act of informing someone.

No, this is a very natural and neutral word order.

The sentence is:

• Muutoksenhaku = subject
• alkaa = verb
• tiedoksiannon jälkeen = time expression

So it follows a straightforward pattern:

subject + verb + adverbial

Finnish word order is fairly flexible, so other orders are possible for emphasis, for example:

• Tiedoksiannon jälkeen muutoksenhaku alkaa.

That would still be grammatical, but the original version sounds like a neutral statement.

That is because the genitive form of tiedoksianto is not made by simply adding -n to the end in a mechanical way.

The word belongs to a type where the stem changes:

• tiedoksianto → tiedoksiannon

You can think of it as following the same pattern as:

• anto → annon

So this is a normal inflection pattern, not a spelling mistake. Finnish noun inflection often changes the stem a little when cases are added.