Complex sentence: However, starting in 2009, this number rapidly increased each year, with a brief decrease in 2012; the 2014 total of 3.0 + magnitude earthquakes through May 2 was higher than the entire yearly total for 2013, at over 140 earthquakes.
Split into simpler sentences: However, starting in 2009, this number rapidly increased each year, with a brief decrease in 2012. The 2014 total of 3.0 + magnitude earthquakes through May 2 was higher than the entire yearly total for 2013, at over 140 earthquakes.