Complex sentence: It was confirmed on 26 March 2009 that the BBC would move the filming of "Casualty" to studios in Cardiff in 2011 in a purpose built studio and backlot set at the BBC Roath Lock Studios in Cardiff.
Split into simpler sentences: It was confirmed on 26 March 2009 that the BBC would move the filming of "Casualty" to studios in Cardiff in 2011. As of late 2011, "Casualty" began filming in a purpose built studio and backlot set at the BBC Roath Lock Studios in Cardiff.