Complex sentence: The link is promoted by the East West Rail Consortium, which was initiated by Ipswich Borough Council in 1995 and which it chaired for 10 years, before in 2005 Buckinghamshire County Council took over chairing the Consortium.
Split into simpler sentences: The link is promoted by the East West Rail Consortium, which was initiated by Ipswich Borough Council in 1995 and which it chaired for 10 years. In 2005 Buckinghamshire County Council took over chairing the Consortium.