Complex sentence: January 2006-She attempted a comeback after suffering a knee injury and surgercal repair a year prior (see "Significant Injuries" section) Her first race back was supposed to be the NBL Boulder Dam National in Boulder City, Nevada on February 25,2009.
Split into simpler sentences: January 2006-She attempted a comeback after suffering a knee injury and surgercal repair a year prior (see "Significant Injuries" section) -? After another hiatus Her first race back was supposed to be the NBL Boulder Dam National in Boulder City, Nevada on February 25,2009.