Complex sentence: The school takes in girls between the ages of 11 and 16 and in 2006 the school joined a federation of schools in South London called the Harris Federation named after the Lord Harris of Peckham who is sponsoring them.
Split into simpler sentences: The school takes in girls between the ages of 11 and 16. In 2006 the school joined a federation of schools in South London called the Harris Federation named after the Lord Harris of Peckham who is sponsoring them.