Oricât de epuizat este participantul, ajunge la linia de sosire.

Oricât de is a very common Romanian pattern meaning however, no matter how, or as ... as may be before an adjective or adverb.

So:

• oricât de epuizat = no matter how exhausted
• Oricât de epuizat este participantul = No matter how exhausted the participant is

This structure is often used to introduce a contrast:

• Oricât de greu este, continuă. = No matter how hard it is, he/she continues.
• Oricât de repede aleargă, nu îl prinde. = However fast he runs, he doesn’t catch him.

So in your sentence, it sets up the idea that the participant’s exhaustion does not prevent the final result.

Both word orders are possible in Romanian, but they do not sound exactly the same.

• participantul este epuizat = a more neutral order
• epuizat este participantul / oricât de epuizat este participantul = a more natural order in this fixed type of construction

After oricât de + adjective, Romanian often places the verb before the subject:

• Oricât de obosit este omul...
• Oricât de dificilă este situația...

This word order sounds smooth and idiomatic. It is not something you should translate word-for-word from English; it is just how Romanian commonly builds this pattern.

Epuizat is the masculine singular form of the adjective, because it agrees with participantul, which is masculine singular.

Agreement in Romanian means the adjective changes to match the noun’s gender and number.

Here are the main forms:

• masculine singular: epuizat
• feminine singular: epuizată
• masculine plural: epuizați
• feminine plural: epuizate

So:

• participantul epuizat = the exhausted participant
• participanta epuizată = the exhausted female participant
• participanții epuizați = the exhausted participants

In your sentence, since participantul is masculine singular, epuizat is the correct form.

Here ajunge means reaches or gets to.

So:

• ajunge la linia de sosire = reaches the finish line

Depending on context, English might translate it as:

• reaches the finish line
• gets to the finish line
• makes it to the finish line

Romanian a ajunge often means to arrive, to reach, or to get somewhere.

Examples:

• Ajung acasă la șase. = I get home at six.
• Am ajuns la gară. = We arrived at the station.
• A ajuns la finalul cursei. = He reached the end of the race.

So in this sentence, it emphasizes successful arrival at the finish line.

Because a ajunge commonly takes la before a destination.

So:

• a ajunge la gară = to arrive at the station
• a ajunge la hotel = to get to the hotel
• a ajunge la linia de sosire = to reach the finish line

As for linia de sosire:

• linia = the line
• de sosire = of arrival / finish

Together, linia de sosire is the normal Romanian expression for finish line.

This is very similar to English noun phrases like finish line, except Romanian often uses de + noun where English uses a compound noun.

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

So:

• participant = participant
• participantul = the participant

and

• linie = line
• linia = the line

This is one of the most important features of Romanian grammar.

A few more examples:

• băiat = boy

• băiatul = the boy

• fată = girl

• fata = the girl

• om = person
• omul = the person

So participantul and linia are definite: the participant, the line.

The comma separates the subordinate clause from the main clause.

• Oricât de epuizat este participantul = subordinate concessive clause
• ajunge la linia de sosire = main clause

The first part gives a condition or contrast: no matter how exhausted the participant is The second part gives the result: he reaches the finish line

Romanian normally uses a comma in this kind of sentence, just as English often does:

• No matter how tired he is, he finishes the race.

So the comma is both grammatical and helpful for clarity.

Yes, it is a complete subordinate clause.

It has:

• the marker oricât de
• the adjective epuizat
• the verb este
• the subject participantul

Literally, it is something like:

• However exhausted the participant is

But by itself, it usually feels incomplete in meaning, because oricât de normally introduces a contrast that expects a main clause after it.

So while it is grammatically a clause, in real usage it usually continues into something else:

• Oricât de epuizat este participantul, continuă.
• Oricât de epuizat este participantul, nu renunță.
• Oricât de epuizat este participantul, ajunge la linia de sosire.

No. It is very often used with adjectives, but it can also be used with adverbs and similar expressions of degree.

With adjectives:

• Oricât de greu este examenul... = No matter how hard the exam is...
• Oricât de frumoasă este priveliștea... = However beautiful the view is...

With adverbs:

• Oricât de repede aleargă... = No matter how fast he runs...
• Oricât de bine cântă... = However well she sings...

So the pattern is broader than just one adjective. The key idea is always degree: no matter how much, how strongly, how intensely, how fast, how difficult, and so on.

In this sentence, ajunge most naturally states the result as a fact: he reaches the finish line.

But depending on context, English may choose a slightly stronger phrasing like:

• he still makes it to the finish line
• he manages to reach the finish line

That extra nuance comes from the whole sentence, not from ajunge alone. The contrast created by Oricât de epuizat... makes the result sound impressive or unexpected.

So:

• ajunge itself = reaches / gets to
• the full sentence = despite being very exhausted, he still gets there

Yes, very much so.

The pattern

• Oricât de + adjective/adverb + verb + subject, main clause

is standard and natural Romanian.

Your sentence sounds idiomatic and clear. It is the kind of structure Romanian speakers use to express concession or contrast.

Similar natural examples would be:

• Oricât de obosit este studentul, își termină tema.
• Oricât de dificil este traseul, ei continuă.
• Oricât de târziu este, o să vină.

So this sentence is a very good model for learning how Romanian expresses no matter how... constructions.