Pojištění odpovědnosti není pojištění storna cesty.

It follows a very common Czech pattern:

X není Y = X is not Y

So here:

• Pojištění odpovědnosti = liability insurance
• není = is not
• pojištění storna cesty = trip cancellation insurance

Grammatically, both halves are noun phrases, and není links them.

Because Czech is saying:

• liability insurance is not
• trip cancellation insurance

If you removed the second pojištění, you would change the meaning. For example:

• storno cesty = cancellation of the trip
• pojištění storna cesty = insurance for trip cancellation

So the repeated pojištění is necessary.

Pojištění means insurance or insurance policy, depending on context.

It is a neuter noun. In this sentence, it appears twice in the same form:

• Pojištění odpovědnosti
• pojištění storna cesty

Czech often builds types of insurance as:

• pojištění + genitive noun

So literally:

• insurance of liability
• insurance of trip cancellation

It can mean both, depending on context.

• In general language, odpovědnost often means responsibility.
• In insurance and legal contexts, it often corresponds to liability.

So:

• pojištění odpovědnosti = liability insurance

That is a standard expression.

Because after pojištění, Czech usually puts the thing insured in the genitive case.

So:

• odpovědnost = nominative
• odpovědnosti = genitive singular

This is similar to English insurance of liability, except Czech shows the relationship with a case ending instead of a separate word like of.

Storno means cancellation.

It is a common word in travel, bookings, tickets, and payments. In this sentence:

• storno cesty = cancellation of a trip/journey

So:

• pojištění storna cesty = insurance covering trip cancellation

This is another genitive construction.

Break it down like this:

• storno = cancellation
• storna = of cancellation
• cesta = trip/journey
• cesty = of the trip / of a trip

So Czech is stacking nouns:

• pojištění storna cesty
• literally: insurance of cancellation of a trip

This kind of noun chain is very normal in Czech.

Because Czech works differently from English in two important ways:

1. Czech has no articles

   • no direct equivalent of a/an/the

2. Czech often uses case endings instead of prepositions like of

   • odpovědnosti already means something like of liability
   • storna cesty means of the cancellation of the trip

So English needs extra words, but Czech often expresses the same relationship through endings.

Není is the negative form of je (is).

It comes from the verb být = to be.

Here:

• je = is
• není = is not

It is singular because the subject is singular:

• Pojištění odpovědnosti = one thing, a singular noun phrase

So není is exactly what you would expect.

Yes, cesta can mean several related things, depending on context:

• road/path/way
• journey/trip

In travel and insurance contexts, cesta often means trip or journey.

So here:

• storno cesty is naturally understood as trip cancellation, not cancellation of a road

Context makes that clear.

This order is natural and neutral:

• Pojištění odpovědnosti není pojištění storna cesty.

You could reverse the two noun phrases:

• Pojištění storna cesty není pojištění odpovědnosti.

That is still grammatical, but the focus changes slightly. The first thing mentioned usually becomes the topic.

So the original sentence is a normal way to say: Liability insurance is not trip cancellation insurance.