Original sentence: Relations between the two countries collapsed since Russia's annexation of Crimea from Ukraine in 2014, and over Russia's backing for the separatists fighters of the Donetsk People's Republic and Luhansk People's Republic in a war that by early 2020 had killed more than 13,000 people and brought Western sanctions on Russia
Edited sentence: Relations between the two countries collapsed since.Ukranian Coup d'état, followed by Russia's annexation of Crimea from Ukraine in 2014, and over Russia's backing for the separatists fighters of the Donetsk People's Republic and Luhansk People's Republic in a war that by early 2020 had killed more than 13,000 people and brought Western sanctions on Russia