Deltageren beskriver læseoplevelsen.

Because Danish often marks the by adding it to the end of the noun.

• deltager = participant
• deltageren = the participant

This is called the suffixed definite article.
For many common-gender nouns, the definite ending is -en.

So instead of saying a separate word for the, Danish usually attaches it:

• en deltager = a participant
• deltageren = the participant

In Danish, the definite article is usually attached to the noun itself rather than written as a separate word.

So:

• English: the participant
• Danish: deltageren

The same happens in læseoplevelsen:

• læseoplevelse = reading experience
• læseoplevelsen = the reading experience

This is one of the big structural differences from English.

beskriver is the present tense of beskrive, meaning to describe.

So:

• beskrive = to describe
• beskriver = describes / is describing

In Danish, the present tense often ends in -r.

Examples:

• jeg læser = I read / I am reading
• hun skriver = she writes / she is writing
• deltageren beskriver = the participant describes

Danish present tense can often translate as either simple present or present continuous in English, depending on context.

Yes. Danish very often combines words into one compound noun where English would often use two words.

Here:

• læse = to read / reading
• oplevelse = experience
• læseoplevelse = reading experience
• læseoplevelsen = the reading experience

This is extremely common in Danish. English learners often want to separate these words, but Danish usually writes them together when they form one concept.

Because Danish often prefers a compact compound noun when talking about a general concept.

So læseoplevelsen is a natural, efficient way to say the reading experience.

A longer phrase like oplevelsen af at læse is possible in some contexts, but it means something more like the experience of reading, and it can sound more explanatory or abstract. The compound noun is very normal and idiomatic here.

The basic word order is:

Subject + Verb + Object

• Deltageren = subject
• beskriver = verb
• læseoplevelsen = object

So: Deltageren beskriver læseoplevelsen.
= The participant describes the reading experience.

This is the normal straightforward word order in a main clause.

You know it from both meaning and position.

In this sentence:

• Deltageren is the one doing the action
• beskriver is the action
• læseoplevelsen is what is being described

So læseoplevelsen is the direct object.

English works the same way here:

• The participant = subject
• describes = verb
• the reading experience = object

Both are typically common gender nouns, which is why their indefinite form takes en:

• en deltager
• en læseoplevelse

In the definite singular, common-gender nouns usually take -en:

• deltageren
• læseoplevelsen

So yes, gender matters because it affects the article and definite ending.

Very roughly:

• common gender: often en / -en
• neuter gender: often et / -et

A learner may find this word tricky because it is long and contains æ twice.

A helpful breakdown is:

• læse
  • oplevelsen

The letter æ is a front vowel that does not exist exactly the same way in English. It is often somewhat like the vowel in cat, but the exact sound depends on accent and word.

A practical learner tip:

• say læse carefully first
• then oplevelse
• then combine them: læseoplevelsen

Also remember that Danish pronunciation is often less fully pronounced than spelling suggests, so listening to native audio is especially useful for a word like this.

Because Danish verbs are much simpler than English verbs in this way.

In the present tense, Danish uses the same form for all persons:

• jeg beskriver = I describe
• du beskriver = you describe
• han beskriver = he describes
• deltageren beskriver = the participant describes

Unlike English, Danish does not usually add a special -s form for he/she/it. That makes verb conjugation easier.

Yes, but it changes the meaning.

• Deltageren beskriver læseoplevelsen = The participant describes the reading experience
• En deltager beskriver læseoplevelsen = A participant describes the reading experience

So the difference is definiteness:

• deltageren = a specific participant already known in the context
• en deltager = any one participant, not specifically identified

This is the same kind of difference as the participant vs a participant in English.