Complex sentence: Further discontent was brought by fact that many of its leaders, including its president, Ion Iliescu were ex-communists and the revolution was seen as being hijacked and that all the victims of the revolution died in vain.
Split into simpler sentences: Further discontent was brought by fact that many of its leaders, including its president, Ion Iliescu, were ex-communists. The protesters believed that the revolution had been hijacked and were concerned that all the victims of the revolution might have died in vain.