Complex sentence: Marriage law in each jurisdiction is the responsibility of the respective law-making body: the UK Parliament in the case of England & Wales, the Scottish Parliament in the case of Scotland and the Northern Ireland Assembly in the case of Northern Ireland.
Split into simpler sentences: Marriage law in each jurisdiction is the responsibility of the respective law-making body. The UK Parliament In the case of England & Wales, the Scottish Parliament in the case of Scotland and the Northern Ireland Assembly in the case of Northern Ireland.