Complex sentence: The main tenet of contextualist epistemology, no matter what account of knowledge it is wedded to, is that when we attribute knowledge to someone, what matters is in what context we use the term'knowledge'.
Split into simpler sentences: The main tenet of contextualist epistemology, no matter what account of knowledge it is wedded to, is that knowledge attributions are context-sensitive. That is, when we attribute knowledge to someone, what matters is the context in which we use the term'knowledge'.