Complex sentence: After the parliamentary elections on 4 December 2011, tens of thousands Russians engaged in protests against alleged electoral fraud, the largest protests in Putin's time; protesters criticized Putin and United Russia and demanded annulment of the election results.
Split into simpler sentences: After the parliamentary elections on 4 December 2011, tens of thousands Russians engaged in protests against alleged electoral fraud, the largest protests in Putin's time. Protesters criticized Putin and United Russia and demanded annulment of the election results.