Complex sentence: In 2009 Long contributed to "The handbook of near-death experiences: thirty years of investigation" published by Praeger, a comprehensive critical review of the research carried out within the field of near-death studies, which is a relevant publication in the field.
Split into simpler sentences: In 2009 Long contributed to "The handbook of near-death experiences: thirty years of investigation", published by Praeger. The book is a comprehensive critical review of the research carried out within the field of near-death studies and considered to be a relevant publication in the field.