Complex sentence: While never traveling again Tylor continued to study the customs and beliefs of tribal communities, both existing and prehistoric (based on archaeological finds) and published his second work, "Researches into the Early History of Mankind and the Development of Civilization", in 1865.
Split into simpler sentences: While never traveling again, Tylor continued to study the customs and beliefs of tribal communities, both existing and prehistoric (based on archaeological finds). He published his second work, "Researches into the Early History of Mankind and the Development of Civilization", in 1865.