Complex sentence: The Lee Valley Athletics Centre is located at the Lee Valley Leisure Complex formerly known as Picketts Lock in Edmonton, London Borough of Enfield, which cost £15m to build was officially opened on 16 January 2007 by Minister for the Olympics, Tessa Jowell.
Split into simpler sentences: The Lee Valley Athletics Centre is located at the Lee Valley Leisure Complex formerly known as Picketts Lock in Edmonton, London Borough of Enfield. The centre cost £15m to build, and was officially opened on 16 January 2007 by Minister for the Olympics, Tessa Jowell.