Complex sentence: This film describes a project called The DHARMA Initiative, and explains that the viewers must enter a code into the computer every 108 minutes for the next 540 days, after which replacements will arrive.
Split into simpler sentences: This film describes a project called The DHARMA Initiative. He further explains that the viewers must enter a code into the computer every 108 minutes for the next 540 days, after which replacements will arrive.