Såvida inte inspelningen visar något annat bröt tjuven sig in.

Såvida inte means unless.

It introduces a condition that would change what follows. In this sentence, it sets up an exception: the statement is true unless the recording shows something different.

It is a bit more formal or written than everyday om inte, although both can often work.

Examples:

• Såvida inte det regnar går vi ut.
  = We’re going out unless it rains.
• Såvida inte du hör något annat börjar mötet klockan tre.
  = Unless you hear otherwise, the meeting starts at three.

This is because Swedish main clauses follow the V2 rule: the finite verb usually comes in the second position.

The sentence begins with the subordinate clause:

Såvida inte inspelningen visar något annat

After that comes the main clause. Since the first position is already taken by the subordinate clause, the finite verb of the main clause comes next:

• bröt = finite verb
• tjuven = subject

So:

• Såvida inte inspelningen visar något annat, bröt tjuven sig in.

This is very typical Swedish word order.

Compare:

• Tjuven bröt sig in.
• I går bröt tjuven sig in.
• Såvida inte inspelningen visar något annat bröt tjuven sig in.

In all of these, the finite verb stays in second position in the main clause.

In modern Swedish, commas are used less than in English. A comma after an introductory subordinate clause is often optional, and many writers leave it out.

So both of these are possible:

• Såvida inte inspelningen visar något annat bröt tjuven sig in.
• Såvida inte inspelningen visar något annat, bröt tjuven sig in.

The version without the comma is perfectly normal in Swedish.

Bryta sig in is a fixed expression meaning to break in.

The verb is:

• infinitive: bryta sig in
• past: bröt sig in

The sig is a reflexive pronoun, but in this expression you should mostly learn the whole phrase as one unit. It is not just bryta in here; the idiomatic form is bryta sig in.

Examples:

• Någon försökte bryta sig in.
  = Someone tried to break in.
• Tjuven bröt sig in genom fönstret.
  = The thief broke in through the window.

Inspelningen is the definite form: the recording.

Swedish usually marks definiteness by adding an ending to the noun:

• en inspelning = a recording
• inspelningen = the recording

Here, the speaker means a specific recording that is already known from the context, so the definite form is used.

Here något means something, and annat agrees with it.

• något is a neuter indefinite pronoun
• so the adjective/pronoun after it takes the neuter form annat

That is why Swedish says:

• något annat = something else / something different

Compare:

• en annan = another / a different one, for common-gender singular nouns
• ett annat = another / a different one, for neuter singular nouns
• något annat = something else

Examples:

• Jag vill ha något annat.
  = I want something else.
• En annan bil
  = another car
• Ett annat hus
  = another house

This is normal and makes good sense.

• bröt is past tense because it describes the event: the thief broke in.
• visar is present tense because it refers to what the recording shows now, or in general when examined.

So the idea is: based on what the recording currently shows, the conclusion is that the thief broke in.

This kind of tense combination is common:

• Om rapporten visar något annat hade vi fel.
  = If the report shows something different, we were wrong.
• Såvitt jag vet kom hon i går.
  = As far as I know, she arrived yesterday.

Yes, in many contexts you could say that.

• Såvida inte inspelningen visar något annat
• Om inte inspelningen visar något annat

Both can mean unless the recording shows otherwise.

The difference is mostly style:

• såvida inte sounds a bit more formal, careful, or written
• om inte is often more everyday and direct

So a learner should understand both, but såvida inte is a useful expression to recognize in written Swedish.

Tjuven means the thief.

The definite form suggests that the thief is identifiable from the context. For example, maybe:

• the speaker has already mentioned the thief
• there was a specific burglary being discussed
• the recording concerns one known suspect

If Swedish used en tjuv, it would mean a thief, which sounds less specific.

Compare:

• Tjuven bröt sig in.
  = The thief broke in.
• En tjuv bröt sig in.
  = A thief broke in.

It is not completely fixed like an idiom, but it is a very common combination.

visa något annat literally means show something else or show something different, and in context it often means indicate otherwise.

So:

• Inspelningen visar något annat
  = The recording shows something different / shows otherwise

You will often see similar phrases:

• Om bevisen visar något annat ...
  = If the evidence shows otherwise ...
• Såvida inte utredningen visar något annat ...
  = Unless the investigation shows otherwise ...

Yes. The sentence sounds fairly formal, especially because of såvida inte.

A more everyday spoken version might be something like:

• Om inte inspelningen visar något annat, så bröt tjuven sig in.
• Om inspelningen inte visar något annat, så var det tjuven som bröt sig in.

The original sentence is perfectly natural, but it feels more like written narration, reporting, or careful analysis than casual speech.