Complex sentence: The "Amadis" and Rabelais' "Gargantua and Pantagruel" were the most important publications that lead into this divide--both books that specifically addressed the new customers of popular histories.
Split into simpler sentences: The "Amadis" and Rabelais' "Gargantua and Pantagruel" were the most important publications that lead into this divide. Both books specifically addressed the new customers of popular histories.