Revisamos la estipulación en que aparece el seguro de responsabilidad civil.

Revisamos can mean either:

• we review / we are reviewing (present indicative), or
• we reviewed (preterite / simple past)

This happens because the nosotros form is the same in both tenses for many -ar verbs.

So only context tells you which meaning is intended.

Examples:

• Cada año revisamos el contrato. = We review the contract every year.
• Ayer revisamos el contrato. = Yesterday we reviewed the contract.

In your sentence, both are grammatically possible unless the wider context makes it clear.

Estipulación is a formal/legal word. It usually means something like:

• stipulation
• clause
• provision
• term (in a legal or contractual sense)

In everyday Spanish, many speakers might more naturally say:

• cláusula
• apartado
• condición (depending on context)

So la estipulación sounds quite legal, technical, or bureaucratic.

Spanish usually uses the definite article more often than English.

Here, la estipulación means the clause/stipulation, referring to a specific one that both speaker and listener can identify, or that is being identified by the relative clause that follows:

• la estipulación en que aparece el seguro...
• literally: the stipulation in which the liability insurance appears

So the article is normal and expected here.

En que here means in which.

It introduces a relative clause and refers back to la estipulación:

• la estipulación en que aparece...
• the clause in which ... appears

So the structure is:

• la estipulación = the clause
• en que = in which
• aparece el seguro... = the insurance appears / is mentioned

This is a fairly formal written structure.

Yes. En la que is also correct, and many learners find it easier because it feels more explicit:

• la estipulación en que aparece...
• la estipulación en la que aparece...

Both can mean the clause in which ... appears.

In many contexts, en la que sounds a bit clearer or more natural in modern usage, while en que can sound slightly more formal or compact.

Sometimes yes, but it depends on style.

You may hear or read:

• la estipulación donde aparece el seguro...

This is understandable and quite common in real usage, especially when talking about a place in a text or document. But in more careful or formal writing, many people prefer:

• en que
• en la que

That is because donde literally means where, and some speakers prefer to use it mainly for actual places, while en que / en la que is more precise for parts of a document.

So for legal or formal Spanish, en que or en la que is usually the safer choice.

Here aparece does not necessarily mean physically appears in front of your eyes. In this context, it means something like:

• appears
• is mentioned
• shows up
• is stated

So:

• la estipulación en que aparece el seguro means
• the clause in which the insurance appears / is mentioned

This use of aparecer is common for words, names, information, and items in texts or documents.

Example:

• Su nombre aparece en el contrato.
• His/Her name appears in the contract.

Both are possible in Spanish.

• ...en que aparece el seguro...
• ...en que el seguro aparece...

The version with aparece el seguro is very natural in Spanish, especially after a relative phrase like en que. Spanish often places the verb before the subject more freely than English does.

So this word order is normal and does not sound unusual.

Seguro de responsabilidad civil is a set phrase meaning liability insurance.

It is built like this:

• seguro = insurance
• de = of
• responsabilidad civil = civil liability / legal liability to third parties

So literally it is something like:

• insurance of civil liability

But in natural English, you would usually say:

• liability insurance

This is standard legal/insurance vocabulary in Spanish.

Because in Spanish, adjectives usually come after the noun.

So:

• responsabilidad civil = civil liability
• seguro obligatorio = mandatory insurance
• contrato legal = legal contract

Putting civil before responsabilidad would sound very unnatural here.

Because de here is linking one noun phrase to another in a general/classifying way.

• seguro de responsabilidad civil means
• insurance for liability / liability insurance

If you said del, that would mean of the, referring to a specific liability already identified:

• el seguro de la responsabilidad civil or
• el seguro del daño depending on context

But the standard name of the type of insurance is simply:

• seguro de responsabilidad civil

Yes, it sounds fairly formal, especially because of:

• estipulación
• en que
• seguro de responsabilidad civil

A more everyday version might be something like:

• Revisamos la cláusula en la que aparece el seguro de responsabilidad civil.

That still sounds fairly formal, but a little more accessible than estipulación.

So the original sentence is grammatical and natural, but it belongs more to a legal/administrative register than everyday conversation.

Yes. A very natural alternative would be:

• Revisamos la estipulación en la que aparece el seguro de responsabilidad civil.

Or, with slightly more common vocabulary:

• Revisamos la cláusula en la que aparece el seguro de responsabilidad civil.

These versions may sound a bit smoother to many learners because en la que is more transparent than en que, and cláusula is often more familiar than estipulación.