No because it is two incomplete clauses joined together by a comma. The clause "always in motion and chattering too" does not have a subject, while the clause "the younger toddler" does not have a verb.
Social literacy<span>. </span>Social literacy<span>, from the perspective of the </span>social<span>-cultural theory, is more than the ability to read and write, and more than mastering </span>literacy<span> skills. ... "</span>Literacy<span> practices and events are always situated in </span>social<span>, cultural, historical and political relationships and embedded in structures of power.</span>