Complex sentence: In April 2009, he resigned from his position as Deputy Treasurer of Illinois and opened a campaign exploratory committee; he formally announced his candidacy for Comptroller on 24 August 2009.
Split into simpler sentences: In April 2009, he resigned from his position as Deputy Treasurer of Illinois and opened a campaign exploratory committee;. He formally announced his candidacy for Comptroller on 24 August 2009.