Complex sentence: After Sarah Farmer became a Bahá'í in 1900 she focused the efforts of the institution with Bahá'í themes-her choice was not without controversy among her fellow workers in the field of working for peace and interfaith cooperation.
Split into simpler sentences: After Sarah Farmer became a Bahá'í in 1900 she focused the efforts of the institution on Bahá'í themes. Her choice was not without controversy among fellow workers striving for peace and interfaith cooperation.