Complex sentence: The northern column quickly captured three bridges over the Zbruch River, while the southern column was battered by a Red Army's 4th Tank Army counterattack which penetrated deep into the pocket, capturing Kamianets-Podilskyi.
Split into simpler sentences: The northern column quickly captured three bridges over the Zbruch River. However, the southern column was battered by a Red Army's 4th Tank Army counterattack which penetrated deep into the pocket, capturing Kamianets-Podilskyi.