Complex sentence: It is believed to contain most of the remaining leading party figures who were not arrested or executed, including Mezher Motni Awad, To’ma Di’aiyef Getan, Jabbar Haddoosh, Sajer Zubair, and Nihad alDulaimi.
Split into simpler sentences: It is believed that it contains most of the remaining, leading party figures who were not arrested or executed. These include Mezher Motni Awad, To’ma Di’aiyef Getan, Jabbar Haddoosh, Sajer Zubair, and Nihad alDulaimi.