Complex sentence: The United Kingdom is set to leave the EU by March 2019, and it will be up to a future UK government to decide whether to have the EU price restrictions on roaming or not after the UK leaves the EU.
Split into simpler sentences: The United Kingdom is set to leave the EU by March 2019. It will be up to a future UK government to decide whether to have the EU price restrictions on roaming or not after the UK leaves the EU.