Complex sentence: The first Best in Show was held on March 19,2009 at the school's auditorium and the 2nd Best in Show was held on November 17,2009 at the same venue.
Split into simpler sentences: The first Best in Show was held on March 19,2009 at the school's auditorium. The 2nd Best in Show was held on November 17,2009 at the same venue.