Complex sentence: Beginning in January 2013, Seymour focused his blog on an ongoing scandal involving allegations of rape committed by a (now former) member of the SWP's central committee, and accepted guest entries from other party members criticizing the party leadership's response.
Split into simpler sentences: Beginning in January 2013, Seymour focused his blog on an ongoing scandal involving allegations of rape committed by a (now former) member of the Socialist Workers Party's (SWP) central committee. He accepted guest entries from other party members criticizing the party leadership's response.