Learn Hardcore Spanish (Latin America): El contrato de alquiler de auto incluye el depósito de garantía. - The car-rental agreement includes the security deposit.

Breakdown of El contrato de alquiler de auto incluye el depósito de garantía.

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Why is it incluye and not incluyen?

Because the subject is El contrato, which is singular.

So the verb has to match that singular subject:

If the subject were plural, then you would use incluyen:

What is the role of de in this sentence, and why does it appear twice?

In this sentence, de is connecting nouns, similar to of in English, though in natural English we often translate it more smoothly.

You have:

So de is building noun phrases.

A good way to see the structure is:

That means something like:

And:

means:

Spanish often uses noun + de + noun where English might prefer an adjective or a compound noun.