Complex sentence: Though it is clear from the accuracy of his drawings that Tavernier received some instruction in the art of cartography/engraving, he was possessed of a wanderlust and while still a teenager traveled extensively through Europe and achieved a working knowledge of its major languages.
Split into simpler sentences: Though it is clear from the accuracy of his drawings that Tavernier received some instruction in the art of cartography/engraving, he was possessed of a wanderlust. While still a teenager, he traveled extensively through Europe and achieved a working knowledge of its major languages.