Complex sentence: In a book published in 2012, Dr Yves Couvreur, a Belgian Pathologist, challenged this hypothesis in a book in which he dissects the official version only to conclude that Lagardère was in fact poisoned.
Split into simpler sentences: In a book published in 2012, Dr Yves Couvreur, a Belgian Pathologist, challenged this hypothesis. In this scientific inquiry he dissects the official version, only to conclude that Lagardere must have been in fact poisoned.