Enerzijds ... anderzijds ... - On the one hand ... on the other hand ... These signal words are a more formal form of the expressions is aan de ene kant ... aan de andere kant... They are very useful to help establish cohesion in a text or speech. and indicate very clearly to the reader or listener that a contrast between two arguments or thoughts is being presented.
Juncker: "Europa verdeeld tussen twee ideologieën: vrije markt enerzijds en politieke integratie anderzijds"
Juncker: "Europe divided between two ideologies: the free market on the one hand and political inegration on the other hand."