Complex sentence: As Vatican Secretary of State, he advocated the controversial Concordat of 1933, hoping it would build trust and respect with the regime, and assisted in drafting the anti-Nazi encyclical, "Mit brennender Sorge".
Split into simpler sentences: As Vatican Secretary of State, he advocated the controversial Concordat of 1933, hoping it would build trust and respect with the regime. He later assisted in drafting the anti-Nazi encyclical, "Mit brennender Sorge".