Properties with multiple values
Multiple values for a property is not a problem for a database like Wikidata. There is nothing wrong with having several values for the same property. For certain statements – such as the children of a person or the official languages of a country – it is perfectly reasonable to have multiple values. Essentially these are additional property-value pairs.
For example for item Star Wars Episode V: The Empire Strikes Back (Q181795) the screenwriter property has these values:
A graphic representation would be: