Complex sentence: It is on the site of Dartford Grammar School but is also open to the local community, and is named after the Rolling Stones singer Mick Jagger who was a pupil at the school.
Split into simpler sentences: It is on the site of Dartford Grammar School; however, it is also open to the local community. The Centre is named after the Rolling Stones singer Mick Jagger, who was a pupil at the school.