Complex sentence: Following the severance of diplomatic ties on 5 June 2017, citizens of Qatar are refused admission and Qatari citizens have been given fourteen days to leave the country; previously citizens of the country didn't require a visa to visit Saudi Arabia.
Split into simpler sentences: Following the severance of diplomatic ties on 5 June 2017, citizens of are refused admission. Previously citizens of the country didn't require a visa to visit Saudi Arabia.