Complex sentence: Oppermann was elected as the First Parliamentary Secretary of the SPD parliamentary group in November 2007, succeeding Olaf Scholz; he was subsequently re-elected in 2011 and 2013.
Split into simpler sentences: Oppermann was elected as the First Parliamentary Secretary of the SPD parliamentary group in November 2007, succeeding Olaf Scholz. He was subsequently re-elected in 2011 and 2013.