Complex sentence: The U.S. Embassy in London has moved to a new location in Nine Elms; it has been open to the public since 13 December 2017 and will be formally opened on 16 January, 2018.
Split into simpler sentences: The U.S. Embassy in London has moved to a new location in Nine Elms. It has been open to the public since 13 December 2017 and will be formally opened on 16 January, 2018.