Complex sentence: But the peaceful coexistence of the local Cayuse and the white missionaries was in a delicate balance, and in 1847, three years after the arrival of the Sager orphans, the balance began to shift to distrust and animosity.
Split into simpler sentences: But the peaceful coexistence of the local Cayuse and the white missionaries was in a delicate balance. In 1847, three years after the arrival of the Sager orphans, this balance began to change and shifted to distrust and animosity.