Complex sentence: FTD moved to the "Attic Studios" built in a converted house in East London in 1999, before finally moved to the "Ferry Lane Studios", a purpose built complex in Rainham Essex for a final time in 2003.
Split into simpler sentences: FTD moved to the "Attic Studios" built in a converted house in East London in 1999. FTD finally moved to the "Ferry Lane Studios", a purpose built complex in Rainham Essex for a final time in 2003.