Complex sentence: As they make love in an undergound tomb, strange and bizarre occurances take place above ground and as night falls, they frantically try to escape from the cemetery, and with no luck, end up where they started.
Split into simpler sentences: As they make love in an underground tomb, strange and bizarre occurrences take place above ground. As night falls, they frantically try to escape from the cemetery, and with no luck, end up where they started.