Complex sentence: The school's Combined Cadet Force was formed in April 2001, as of 2009 it parades around 50-60 cadets every week with approximately 10 RAF cadets and 40-50 Army cadets.
Split into simpler sentences: The school's Combined Cadet Force was formed in April 2001. Since then it has grown to parading around 50-60 cadets every week with approximately 10 RAF cadets and 40-50 Army cadets.