Complex sentence: The victory at Loznica, Banja Koviljača, Zavlaka, and Krupanj released most of the western Serbia from Axis occupation where remaining German forces were blocked in Šabac and Valjevo, encircled by rebel forces.
Split into simpler sentences: The victory at Loznica, Banja Koviljača, Zavlaka, and Krupanj released most of the western Serbia from Axis occupation. The remaining German forces were blocked in Šabac and Valjevo, encircled by the rebel forces.