Complex sentence: The series of riots that occurred in several locations of downtown Kiev, Ukraine, on 1 December 2013, is considered the most violent, controversial and widely-publicized event of the ongoing Euromaidan protets campaign.
Split into simpler sentences: The series of riots occurred in several locations of downtown Kiev, Ukraine, on 1 December 2013. It was the violent, controversial and widely-publicized event of the ongoing Euromaidan protets campaign.