"La sumo kiun li postulis estis dek eŭroj."
Translation:The total that he demanded was ten euros.
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No, you missed the fairly common linguistic trick of using a phrase as an adjective. The phrase kiun li postulis describes "sumo" and is treated in relation to the rest of the sentence as if there is no verb in it .
I'm sure that one of the language wonks can give you a more definitive explanation, I'm just remembering High School English classes here.