Complex sentence: The losses of the Germans were 9270 killed and wounded and 1370 missing, or 13%; those of the French were about 8000 killed and wounded, and perhaps 12,000 missing, and prisoners, representing a total loss of about 41%.
Split into simpler sentences: The losses of the Germans were 9270 killed and wounded and 1370 missing, or 13%. Those of the French were about 8000 killed and wounded, and perhaps 12,000 missing, and prisoners, representing a total loss of about 41%.