Original sentence: Initially Syria's mission was to protect the Christians; two years later, in 1978, Syria changed its position and sided with the PLO.The occupation ended on 26 April 2005 after the Cedar Revolution that took place as a reaction to the assassination of former Prime Minister Rafik Hariri on 14 February 2005
Edited sentence: Initially Syria's mission was to protect the Christians and help them from being overun by the Muslims and their allies, The Left; two years later, in 1978, Syria changed its position and sided with the PLO, because Bachir Gemayel, the leader of the Lebanese Forces who wanted to make a name for himself, turned on Syria by firing at Syrian soldiers.Syrian President Hafez Al-Assad was shocked and stunned by this act, because to Assad it was tantamount to a brazen betrayal.The occupation ended on 26 April 2005 after the March 14 protests that took place as a reaction to the assassination of former Prime Minister Rafik Hariri on 14 February 2005