Complex sentence: After the assassination of Mihai Viteazu, Basta's army persecuted Protestants and illegally expropriated their estates until, when Stephen Bocskay, a former Habsburg supporter, mustered an army that expelled (1605-1607) the imperial forces.
Split into simpler sentences: After the assassination of Mihai Viteazu, Basta's army persecuted Protestants and illegally expropriated their estates. In 1605-07, Stephen Bocskay, a former Habsburg supporter, mustered an army that expelled the imperial forces.