Complex sentence: Quintin Kynaston was rated'outstanding' by Ofsted in two previous inspections, in 2008 and December 2011, but lost its'outstanding' rating during the most recent Ofsted visit in September 2014.
Split into simpler sentences: Quintin Kynaston was rated'outstanding' by Ofsted in two previous inspections, in 2008 and December 2011. However, it lost its'outstanding' rating during the most recent Ofsted visit in September 2014.