Complex sentence: This is the first discovery in Britain of evidence that Neolithic peoples used paint to decorate their buildings and is similarly coloured to the natural shades of sandstone used in the construction of the inner sanctum.
Split into simpler sentences: This is the first discovery in Britain of evidence that Neolithic peoples used paint to decorate their buildings. It is coloured similarly to the natural shades of sandstone used in the construction of the inner sanctum.