Complex sentence: The number of tourist arrivals reached a record in 2012 at 6.1 million, dropped to 3.8 million in 2014, and, according to the Russian administration of Crimea, rebounded to 5.6 million by 2016.
Split into simpler sentences: The number of tourist arrivals reached a record in 2012 at 6.1 million. According to the Russian administration of Crimea, they dropped to 3.8 million in 2014, and rebounded to 5.6 million by 2016.