Complex sentence: A referendum on merging Chita Oblast and Agin-Buryat Autonomous Okrug into Zabaykalsky Krai was held on 11 March 2007; since the referendum succeeded, a new region will be formed on 1 March 2008.
Split into simpler sentences: A referendum on merging Chita Oblast and Agin-Buryat Autonomous Okrug into Zabaykalsky Krai will be held on 11 March 2007. If the referendum succeeds, a new region will be formed on 1 March 2008.