Complex sentence: The school's music program is best known for its Jazz Ensemble I. The ensemble is known throughout the greater Seattle area, and has been accepted into the Essentially Ellington jazz festival on four occasions, in 2003,2007,2010, and 2013.
Split into simpler sentences: The school's music program is best known for its Jazz Program. The Jazz Ensemble I is known throughout the greater Seattle area, and has been accepted into the Essentially Ellington jazz festival on four occasions, in 2003,2007,2010, and 2013.