Complex sentence: In March 2016, Finland and Russia announced that the Raja-Jooseppi border crossing at Inari and the Salla border crossing will be temporarily closed from third country nationals: only Finnish, Russian and Belarusian citizens are allowed to use these crossings for at least 6 months.
Split into simpler sentences: In March 2016, Finland and Russia temporarily closed the Raja-Jooseppi border crossing at Inari and the Salla border crossing from third country nationals. Only Finnish, Russian and Belarusian citizens were allowed to use these crossings for a period of 6 months.