Complex sentence: There is a K-6 grade charter school at Mesa del Sol, an International School that opened in 2009 and school officials plan to extend school to 8th grade in August 2013 as well move into permanent building.
Split into simpler sentences: There is a K-6 grade charter school at Mesa del Sol, The International School, which opened in 2009. School officials plan to extend school to 8th grade by August 2013 as well move into permanent building.