Translation:There are two pillows and a blanket on the bed.
There are two subject nouns in this sentence, and both of them are in the singular form. In that case, you'll usually use the singular verb form in Hungarian (although it's also okay to use vannak here). The plural verb form is mostly only used if one or more subject nouns appear in their plural form.
- Két párna van az ágyon.
- Párnák vannak az ágyon.