Complex sentence: The film is very loosely based on the non-fiction book of the same name by ethnobotanist Wade Davis, wherein Davis recounted his experiences in Haiti investigating the story of Clairvius Narcisse, who was allegedly poisoned and buried alive.
Split into simpler sentences: The film is very loosely based on the non-fiction book of the same name by ethnobotanist Wade Davis. Davis' book recounted his experiences in Haiti investigating the story of Clairvius Narcisse, who was allegedly poisoned and buried alive.