Complex sentence: He was responsible for the construction of and move to the Britannia Stadium in 1997 which included selling 10 year naming rights to Britannia Building Society, and led the negotiations which saw an Icelandic consortium purchase a controlling interest in the club.
Split into simpler sentences: He was responsible for the construction of and move to the Britannia Stadium in 1997 which included selling 10 year naming rights to Britannia Building Society. He also led the negotiations which saw an Icelandic consortium purchase a controlling interest in the club.