Sentence:  But it is also true that Braque was the consistent <WSD>pioneer</WSD> in the use of simulated textures as well as of typography ; and moreover , he had already begun to broaden and simplify the facet-planes of Analytical Cubism as far back as the end of 1910 . 
Meaning of the word marked with <WSD> tags:  someone who helps to open up a new line of research or technology or art