Volontären samordnar deltagarna.

Because Swedish usually puts the definite article at the end of the noun instead of using a separate word like the.

• en volontär = a volunteer
• volontären = the volunteer

For a common-gender noun like volontär, the definite singular ending is usually -en.

For the same reason: -na is the definite plural ending here.

• en deltagare = a participant
• deltagare = participants / participant(s) in some contexts
• deltagarna = the participants

So deltagarna is the plural definite form.

Samordnar is the present tense of the verb samordna, meaning coordinate.

• att samordna = to coordinate
• samordnar = coordinates / is coordinating

In Swedish, the present tense is the same for all persons:

• jag samordnar = I coordinate
• du samordnar = you coordinate
• han/hon samordnar = he/she coordinates

So unlike English, Swedish verbs do not add a special -s only for he/she/it.

Because Swedish often expresses definiteness by attaching it to the noun itself.

So instead of saying:

• the volunteer
• the participants

Swedish says:

• volontären
• deltagarna

This is one of the most important structural differences from English.

Mostly from word order.

In Volontären samordnar deltagarna:

• Volontären comes first, so it is the subject: the one doing the action
• samordnar is the verb
• deltagarna comes after the verb, so it is the object: the ones being coordinated

So the structure is:

Subject + Verb + Object

This is the normal word order in a basic Swedish statement.

Yes, but that would mean something different:

• Deltagarna samordnar volontären = The participants coordinate the volunteer

Because Swedish relies a lot on word order, switching the nouns changes who does the action.

Volontär is a real and common word, especially in organizations, events, charities, and community work.

Another useful word is frivillig:

• volontär = volunteer
• frivillig = volunteer / voluntary, depending on context

In many contexts, both can appear, but volontär clearly refers to a person acting as a volunteer.

Ordna often means arrange, organize, or fix something.

Samordna is more specifically coordinate—bringing people, tasks, or activities together so they work smoothly.

So in this sentence, samordnar suggests that the volunteer is managing or coordinating the participants, not just generally arranging something.

A careful approximate pronunciation is:

vo-lon-TEH-ren sam-ORD-nar del-TA-gar-na

A few helpful notes:

• ä sounds somewhat like the vowel in English bed, though not exactly the same
• ord in samordnar has a clear o sound that is not like English or
• stress falls roughly on:
  • volonTÄRen
  • samORDnar
  • delTAgarna

If you want to sound natural, focus especially on the stressed syllables.

Because samordnar already means coordinates or is coordinating, depending on context.

Swedish present tense often covers both:

• simple present: coordinates
• present ongoing meaning: is coordinating

So Volontären samordnar deltagarna can work in both a general and a current-action sense, depending on the situation.