Complex sentence: On 10 May, another German attack at Chevreux was defeated and the French advanced north of Sancy and on the night of and the following day, German attacks were repulsed on the Californie Plateau and at Cerny.
Split into simpler sentences: On 10 May another German attack at Chevreux was defeated and the French advanced north of Sancy. On the night of and the following day, German attacks were repulsed on the Californie Plateau and at Cerny.