Complex sentence: This attempt achieved the signing of the "Reichskonkordat" on July 20,1933, which prevented the Catholic Church and priests from any political activity, undermining any potential resistance they might have to Nazi policies.
Split into simpler sentences: This attempt achieved the signing of the Reichskonkordat on July 20,1933. The Concord prevented the Catholic Church and Priests from any political activity, undermining any potential resistance they might have against Nazi policies.