Complex sentence: Before joining the Saenuri Party, Ji was formerly a spokesman for the Liberty Forward Party, and ran as that party's candidate for Mayor of Seoul in 2010, and was nominated again for the post in 2011 but withdrew before the election took place.
Split into simpler sentences: Before joining the Saenuri Party, Ji was formerly a spokesman for the Liberty Forward Party, and ran as that party's candidate for Mayor of Seoul in 2010. He was nominated again for the post in 2011 but withdrew before the election took place.