Complex sentence: Since then, the Republicans have been in moderate opposition to Saakashvili's administration, but joined other opposition parties in the 2007 anti-government demonstrations and supported a joint opposition candidate Levan Gachechiladze in the early 2008 presidential election.
Split into simpler sentences: Since then, the Republicans have been in moderate opposition to Saakashvili's administration. They joined other opposition parties in the 2007 anti-government demonstrations and supported a joint opposition candidate Levan Gachechiladze in the early 2008 presidential election.