A rozsdás láncot és a törött pedált javíttatom.

It is the causative form of javít (to repair).

So javíttatom means something like:

• I am having it repaired
• I’m getting it repaired
• I make someone repair it

In everyday use, it often implies that someone else does the actual repair.

It can be broken down like this:

• javít = repair
• -tat / -tet = causative suffix (have/make someone do)
• -om = I with a definite object

So:

javít → javíttat → javíttatom

The form means I have ... repaired.

Because the base verb javít already ends in t, and the causative suffix also begins with t.

So when they come together, you get:

• javít
  • -tat → javíttat

That double tt is normal Hungarian spelling here.

Because Hungarian has definite and indefinite verb conjugation.

Here the objects are definite:

• a rozsdás láncot = the rusty chain
• a törött pedált = the broken pedal

Since the speaker is acting on definite objects, Hungarian uses the definite conjugation, and in 1st person singular that gives -om:

• javíttatom = I have it/them repaired

They are both direct objects, so they take the accusative ending -t.

• lánc → láncot
• pedál → pedált

In Hungarian, direct objects are usually marked this way.

Hungarian often adds a linking vowel before the accusative -t, but not always.

So:

• lánc becomes láncot
• pedál becomes pedált

Which pattern a noun follows depends on its word shape and Hungarian sound patterns. Unfortunately, this is something learners often just get used to noun by noun.

Because in Hungarian, when an adjective directly modifies a noun, the case ending usually appears only on the noun, not on the adjective.

So:

• rozsdás láncot
• törött pedált

not rozsdásat láncot or töröttet pedált

But if the adjective stands by itself, then it can take case:

• a töröttet = the broken one (accusative)

Because these are two coordinated definite noun phrases:

• a rozsdás láncot
• a törött pedált

Repeating the article is the normal and clear way to say this, especially when each noun has its own adjective.

It is not said explicitly, because Hungarian often drops subject pronouns when the verb ending already shows who the subject is.

Here -om tells you the subject is I.

So the full version could be:

• Én a rozsdás láncot és a törött pedált javíttatom.

But én is usually unnecessary unless you want emphasis.

Because Hungarian verbs agree with the subject, not with the object.

The subject here is I, so the verb is 1st person singular.

It does not matter that there are two objects:

• the rusty chain
• the broken pedal

The verb still stays singular because I am the one doing the causing.

Because Hungarian word order is much more flexible than English word order.

It is based largely on topic and focus, not on a strict subject-verb-object rule.

So putting the object phrase before the verb is very natural:

• A rozsdás láncot és a törött pedált javíttatom.

The subject is omitted because it is already clear from the verb.

They are related, but not the same:

• javítom = I repair it / I am repairing it
• javíttatom = I have it repaired / I am getting it repaired

So javíttatom adds the idea that the speaker is causing the repair, not necessarily doing the work personally.

Törött means broken and functions here as an adjective.

It comes from the verb tör (to break), but in this sentence you can think of it simply as a normal describing word:

• törött pedál = broken pedal

It behaves like other adjectives in front of a noun.