Fremdriftsplanen er tydelig.

The ending -en is the definite article attached to the noun, like the in English.

• en fremdriftsplan = a progress plan / a schedule
• fremdriftsplanen = the progress plan / the schedule

In Norwegian, the definite article is often added to the end of the noun instead of being a separate word.

Because Norwegian usually builds definiteness into the noun itself.

So instead of saying something like the plan, Norwegian often says:

• planen = the plan
• fremdriftsplanen = the progress plan

A separate determiner can appear in some contexts, especially with adjectives, but in this simple sentence the noun ending does the job by itself.

It is a compound noun, which is very common in Norwegian.

You can think of it as being built from:

• fremdrift = progress, forward movement
• plan = plan

Together:

• fremdriftsplan = progress plan / project schedule / timeline

Then the definite ending is added:

• fremdriftsplanen = the progress plan

Norwegian often combines nouns into one long word where English might use two or more words.

This is the normal basic Norwegian sentence pattern:

• subject + verb + complement

So here:

• Fremdriftsplanen = subject
• er = verb
• tydelig = adjective/complement

This is very similar to English The schedule is clear.

Er is the present tense of å være (to be).

So:

• er = is / am / are, depending on context

In this sentence, it means is:

• Fremdriftsplanen er tydelig = The progress plan is clear

Norwegian verbs do not change form for different persons the way English does. For example:

• jeg er
• du er
• han er
• vi er

The form stays er.

Here tydelig is used as a predicate adjective, meaning it comes after er and describes the subject.

In Norwegian, predicate adjectives usually agree with the noun in gender/number, but with a singular en-word like fremdriftsplan, the basic form is used:

• en plan er tydelig

Compare:

• et svar er tydelig would often become et svar er tydelig? Actually for many adjectives the et-form adds -t, but tydelig already ends in -ig, so the neuter form is also tydelig
• planene er tydelige = the plans are clear

So tydelige would be used for plural or in some attributive contexts, but not here with a singular common-gender noun.

No. Tydelig can mean several related things, such as:

• clear
• distinct
• obvious
• easy to understand

So in this sentence it does not have to mean that the plan is literally easy to see on paper. It can also mean the plan is well defined, easy to understand, or clearly presented.

A rough English-friendly guide would be:

• frem-drifts-pla-nen er TY-de-lig

A few pronunciation notes:

• fremdrift has a short, crisp rhythm
• planen sounds roughly like PLAH-nen
• er is often pronounced quite lightly in everyday speech
• tydelig is roughly TY-de-lig, with the stress on the first syllable

The exact pronunciation depends somewhat on dialect, but the main stress in tydelig is on the first syllable.

Yes, absolutely.

• Planen er tydelig = The plan is clear
• Fremdriftsplanen er tydelig = The progress plan / schedule is clear

Using fremdriftsplanen is more specific. Using planen is more general.

Yes, it is natural and grammatical.

It sounds like something you might say in a workplace, project, or administrative context, especially when discussing:

• project schedules
• timelines
• implementation plans
• progress plans

If you wanted a slightly different nuance, you could also hear things like:

• Fremdriftsplanen er klar. = the schedule is ready / clear
• Fremdriftsplanen er lett å forstå. = the schedule is easy to understand
• Fremdriftsplanen er oversiktlig. = the schedule is well organized / easy to get an overview of

But Fremdriftsplanen er tydelig is perfectly normal.