Complex sentence: The original film has been estimated to be around 7 minutes long, but degraded to a poor condition in the French Film Archives until it was found in 1996, and only two minutes of the film have survived, which include merely undressing.
Split into simpler sentences: The original film has been estimated to be around 7 minutes long, but it had degraded to a poor condition in the French Film Archives until it was found in 1996. Only two minutes of the film have survived, which include merely undressing.