Learn Dutch: We willen graag met jullie samenwerken. - We would like to collaborate with you.

It is the object (specifically, the object of the preposition met). The handy thing about jullie (you, plural) is that it is exactly the same word whether it is the subject doing the action or the object receiving it. This is just like the word "you" in English, but different from other Dutch pronouns like wij (we) versus ons (us).

Where does the "would like" come from in the translation?

It comes from the combination of willen (to want) and graag (gladly). While willen alone means "to want", adding graag softens it and makes it more polite. Saying "we gladly want" is the standard Dutch way to say "we would like".

Why is samenwerken at the very end of the sentence?

Because of the verb willen (to want). In Dutch, when you use a modal (helping) verb like willen, kunnen (can), or moeten (must), the main action verb gets pushed to the very end of the sentence in its full dictionary form.

Is samenwerken a single word?

Yes! It is a separable verb made of samen (together) and werken (to work) that translates to "collaborate" or "work together". In this sentence, it stays glued together as a single word because the helping verb rule puts it at the end of the sentence in its full, unseparated form.