Complex sentence: A group of insurgents exited their vehicle and began opening fire on Ukrainian police, where two SBU officers were killed and several Ukrainian military personnel were injured; one separatist was also killed in the shootout while the remainder fled into the woods.
Split into simpler sentences: A group of insurgents exited their vehicle and began opened fire on the Ukrainian police, killing two SBU officers and injuring several Ukrainian military personnel. One separatist was also killed in the shootout, while the remainder fled into the woods.