Complex sentence: At Zouaves made a costly counter-attack north of Thélus and when the Bavarians attempted to advance they were engaged from the village, which was eventually captured, which enabled Neuville to be occupied unopposed but a new French defensive position was established at La Targette.
Split into simpler sentences: At Zouaves made a costly counter-attack north of Thélus and when the Bavarians attempted to advance they were engaged from the village. Eventually, the capture of Thélus enabled Neuville to be occupied unopposed but a new French defensive position was found at La Targette.