Complex sentence: One of the reasons they give for their dismissal of the films is Phelps being shown, in the first film, as being married and as effectively a traitor; as shown above, these two developments angered many of them, as well as Graves himself.
Split into simpler sentences: One of the reasons they give for their dismissal of the films is Phelps being shown, in the first film, as being married and as effectively a traitor. As shown above, these two developments angered many of them, as well as Graves himself.