Desamenwerking tussen beide bedrijven verloopt soepel.
The cooperation between the two companies is going smoothly.
Ze hebben desamenwerking dit jaar uitgebreid.
They have expanded the cooperation this year.
We zullen desamenwerking graag voortzetten.
We will gladly continue the cooperation.
Note
The article is part of the word: de samenwerking. That way you learn the gender with it.
Remember de samenwerking for good. ripiti brings the word back just before you forget it, with these sentences. Free, no account needed, works offline.