Complex sentence: Creighton was chosen because his love for ritual had created an impression among others that he had a high church outlook; the Peterborough diocese had many high churchmen, and it was felt that Creighton would be a good fit.
Split into simpler sentences: Creighton was chosen because his love for ritual had created an impression among others that he had a high church outlook. The Peterborough diocese had many high churchmen, and it was felt that Creighton would be a good fit.