Original sentence: A brand new £5 million College centre has opened in Priory Park Road, Kilburn, almost opposite the college's old site, which has been sold for housing development.The new building was officially opened on 31 August 2007 by the Mayor of London Ken Livingstone
Edited sentence: A brand new £5 million College centre has opened in Priory Park Road, Kilburn, and was officially opened on 31 August 2007 by the then Mayor of London Ken Livingstone