Complex sentence: Examples of these elements include his notion of the linguistic sign, which is composed of the signifier and the signified, and possibly has a referent, though Saussure took this last question to lie beyond the linguist's purview.
Split into simpler sentences: Examples of these elements include his notion of the linguistic sign, which is composed of the signifier and the signified. Though the sign may also have a referent, Saussure took this last question to lie beyond the linguist's purview.