Complex sentence: The collections held at the BFI National Archive were started in 1935 by Ernest Lindgren, the first curator of what was then called the National Film Library, and now comprise over 275,000 feature, non-fiction and short films (dating from 1894) and 210,000 television programmes.
Split into simpler sentences: The collections held at the BFI National Archive were started in 1935 by Ernest Lindgren, the first curator of what was then called the National Film Library. It now comprises over 275,000 feature, non-fiction and short films (dating from 1894) and 210,000 television programmes.