（重写句子）The Great Wall is the world’s longest human-made structure

（重写句子）The Great Wall is the world’s longest human-made structure, stretching over approximately 6,400 km from Shanhaiguan in the east to Jiayuguan in the west, along an arc roughly drawing the southern edge of Inner Mongolia. (compound-complex sentence)
【正确答案】：The Great Wall is the world's longest human-made structure, and it stretches over approximately 6,400 km from Shanhaiguan in the east to Jiayuguan in the west, along an arc that roughly draws the southern edge of Inner Mongolia.