Complex sentence: Like all of Kneale's 1950s television work for the BBC, "The Quatermass Experiment" was transmitted live, with only the first two episodes being telerecorded and surviving in the BBC's archives.
Split into simpler sentences: Like all of Kneale's 1950s television work for the BBC, "The Quatermass Experiment" was transmitted live. Only the first two episodes were telerecorded and survive in the BBC's archives.