context: In addition to his own books and articles during this period, he also joined Inazo Nitobe in crafting what became his most well-known book, Bushido: The Soul of Japan.
source: The prolific writer was also a prolific traveller, making eleven trips to Europe--primarily to visit the Netherlands.
reference_original: Lo scrittore prolifico fu anche un viaggiatore prolifico, facendo undici viaggi in Europa, principalmente per visitare l'Olanda.
reference_flipped: La scrittrice prolifica fu anche una viaggiatrice prolifica, facendo undici viaggi in Europa, principalmente per visitare l'Olanda.