Complex sentence: In 2005, assistant headteacher Jez Horsley took over after Mr Myers retired and in the summer of 2007, the school received its best GCSE results yet, putting it in the top 100 secondary schools in the country.
Split into simpler sentences: In 2005, assistant headteacher Jez Horsley took over as head, after Mr Myers retired. In the summer of 2007, the school received its best ever GCSE results, placing it in the top 100 secondary schools in the country.