Is there a sentence fragment?
When the Albuquerque International Balloon Fiesta began in 1972, only thirteen hot air balloons took to the sky. The festival drew more than five hundred ballooning teams in 2014.

 - no
 - yes
There is not a sentence fragment. These are complete sentences because they express complete thoughts.
When the Albuquerque International Balloon Fiesta began in 1972, only thirteen hot air balloons took to the sky. The festival drew more than five hundred ballooning teams in 2014.