Complex sentence: Many of the tourist destinations he visited were included in the series, but because of the conflicting portrayals of Tartarus in literature, the author said that he appealed to his imagination to write the scenes of the underworld.
Split into simpler sentences: Many of the tourist destinations he visited were included in the series. But because of the conflicting record of Tartarus in the literature, the author said that he appealed to his imagination to write the scenes of the underworld.