Complex sentence: UDD, the red-shirts, began its mass protest again in early April 2009, aiming at'overthrowing the Amatayathipatai', said'nobles' influence meddling in politics, yet its target was Prem Tinasulanonda, the chief of royal Privy Council.
Split into simpler sentences: UDD, the red-shirts, began its mass protests again in early April 2009, aiming at'overthrowing the so-called "Amatayathipatai" (aristocracy), citing that' nobles'meddle in politics. One of the UDD's targets was Prem Tinasulanonda, the chief of royal Privy Council.