Complex sentence: It might not need a Treaty change to perfect this, merely a preliminary ruling from the CJEU, and supplementary implementation measures from the Council, given the effective right of entrance and residence granted to EU nationals via Article 4 of the Protocol.
Split into simpler sentences: It might not need a Treaty change to perfect this, merely a ruling from the CJEU, and implementation measures from the Council. Given the effective right of entrance and residence granted to EU nationals via Article 4 of the Protocol.