Complex sentence: Speculation regarding whether or not the book was actually an autobiography is incessant, however some believe that because one "relation" is written in third person (the story of Don Melón and Doña Endrina) that the whole poem is fictitious.
Split into simpler sentences: Speculation regarding whether or not the book was actually an autobiography is incessant. However, some believe that because one "relation" is written in third person (the story of Don Melón and Doña Endrina), that the whole poem is fictitious.