Complex sentence: Gangou Drain (the section between Huaiyin and Yangzhou of the Grand Canal of China) connected the Yangtze River and the Huai He delta region and Qian Road and Shan Road on the land reached Southern and Northern China.
Split into simpler sentences: Gangou Drain (the section between Huaiyin and Yangzhou of the Grand Canal of China) connected the Yangtze River and the Huai He delta region. The Qian Road and Shan Road that traversed the region reached Southern and Northern China.