Complex sentence: Nicolas Sarkozy, mayor of Neuilly at the time, managed to obtain the liberation of several children, though he was put aside of the negotiation process later on, being not a professional negotiator and thus risking interference with the police forces.
Split into simpler sentences: Nicolas Sarkozy, mayor of Neuilly at the time, managed to obtain the liberation of several children. He was later put aside of the negotiation process, as he was not a professional negotiator and thus risked interfering with the police forces.