Complex sentence: While that year's sales reached 519,800 making the company the sixth largest Chinese car-maker by units sold in 2010, in 2011 it failed to break into the top ten, but returned to the rankings in 9th place in 2012 by producing 610,000 passenger vehicles.
Split into simpler sentences: While that year's sales reached 519,800 making the company the sixth largest Chinese car-maker by units sold in 2010, in 2011 it failed to break into the top ten. The company returned to the rankings in 9th place in 2012, however, by producing 610,000 passenger vehicles.