Complex sentence: Jingjinji or Jing-Jin-Ji (JJJ) also known as Beijing-Tianjin-Hebei is the national capital region of China, biggest urbanised regions in Northern China an economic hinterland surrounding Beijing, Tianjin, and Hebei along the coast of Bohai Sea.
Split into simpler sentences: Jingjinji or Jing-Jin-Ji (JJJ), also known as Beijing-Tianjin-Hebei, is the national capital region of China. It is the biggest urbanised region in Northern China that includes an economic region surrounding Beijing, Tianjin, and Hebei, along the coast of the Bohai Sea.