Complex sentence: The German artillery group around Estrées, Soyécourt and Fay, attempted a systematic bombardment of the French front line on 30 June and the French replied with shells on one German field regiment alone, which knocked out three guns.
Split into simpler sentences: The German artillery group around Estrées, Soyécourt and Fay attempted a systematic bombardment of the French front line on 30 June. The French replied with shells on one German field regiment alone, which knocked out three guns.