Complex sentence: In December 2001, the Port was the first port in North China to reach the 100 million tonnes mark, in 2004 it reached 200 million tonnes, in 2007 300 million tonnes and in 2010 400 million tonnes.
Split into simpler sentences: In December 2001, the port was the first port in north China to reach the 100 million tonnes mark. In 2004 it reached 200 million tonnes, in 2007 300 million tonnes and in 2010 400 million tonnes.