"Die anstelle gerichtlicher Prüfung des Sachverhalts vorgesehenen politischen Kontrollgremien haben sich in der Vergangenheit aber oft als unzulänglich erwiesen:"

translates to (while keeping the sentence structure the same as much as possible, even if that sounds a bit off in english):

"The, in place of judicial review of the factual matter, arranged political control committees have shown in the past to often be insufficient:"