Original sentence: The lead-up to the 2014 Winter Olympics was marked by several major controversies, including allegations of corruption leading to the severe cost overruns, concerns from politicians and athletes over the effects of Russia's ban on "propaganda of non-traditional sexual relations" on the Games, and various security concerns that Vilayat Dagestan and other such groups may attack Sochi
Edited sentence: The lead-up to the 2014 Winter Olympics were plagued by several major controversies, including allegations of corruption leading to the severe cost overruns, concerns from politicians and athletes over the effects of Russia's ban on "propaganda of non-traditional sexual relations" on the Games, and various security concerns that Vilayat Dagestan and other such groups may attack Sochi