Complex sentence: An extension of the Docklands Light Railway to the area opened in December 2005; this currently terminates at King George V, a further extension south of the river, to Woolwich Arsenal, will open in 2009.
Split into simpler sentences: An extension of the Docklands Light Railway to the area opened in December 2005. Until 2009, this terminated at King George V; a further extension south of the river, to Woolwich Arsenal, opened in 2009.