Complex sentence: Speidel appeared before an Army Court of honour, but Gerd von Rundstedt, Heinz Guderian and Wilhelm Keitel decided not to expel him from the German Army, thus meaning he would not appear before Roland Freisler's People's Court.
Split into simpler sentences: Speidel appeared before an Army Court of honour, but Gerd von Rundstedt, Heinz Guderian and Wilhelm Keitel, who refused to expel him from the German Army. Thus he would not be compelled to appear before Roland Freisler's People's Court.