Complex sentence: The attack on sculptures and paintings had placed the entire church interior under discussion and finding answers to questions such as what a church should be, which type of architecture was suitable and how it should be embellished had become urgent.
Split into simpler sentences: The attack on sculptures and paintings had placed the entire church interior under discussion. Finding answers to questions such as what a church should be, which type of architecture was suitable and how it should be embellished had become urgent.