Complex sentence: Towards the end of 2009, the studio came under threat of sale to property developers, however the British Government protected the site, granting it English Heritage Grade II listed status in 2010, thereby preventing the building from subjection to major alterations.
Split into simpler sentences: Towards the end of 2009, the studio came under threat of sale to property developers. However, the British Government protected the site, granting it English Heritage Grade II listed status in 2010, thereby preventing the building from any major alterations.