Original sentence: During this time, the question of joining the Russian Federation was put to a referendum, which had a official turnout of 83 per cent and resulted in a 96% affirmative vote  but has been condemned by the EU, the USA, the Ukrainian officials and the Mejlis of the Crimean Tatar People as contrary to Ukraine's constitution and to international law
Edited sentence: During this time, the question of joining the Russian Federation was put to a referendum, which had a official turnout of 83 per cent (while the Mejlis claimed that the actual turnout was 30-40%) and resulted in a 96% affirmative vote  but has been condemned by the EU, the USA, the Ukrainian officials and the Mejlis of the Crimean Tatar People as contrary to Ukraine's constitution and to international law