Complex sentence: The Chinese-Russian border around Yanji is a region well-known as susceptible to earthquakes: the most recent earthquake struck in February 2010 and registered 6.5 on the Richter scale.
Split into simpler sentences: The Chinese-Russian border around Yanji is a region well-known as susceptible to earthquakes. The most recent earthquake struck in February 2010 and registered 6.5 on the Richter scale.