Complex sentence: He continued work for 30 years for equal rights, suffrage and education in Ohio and Kansas, where he first went at the end of the American Civil War as general superintendent of refugees and freedmen for the Freedmen's Bureau.
Split into simpler sentences: He continued work for 30 years for equal rights, suffrage and education in Ohio and Kansas. After the American Civil War he went to Kansas as general superintendent of refugees and freedmen for the Freedmen's Bureau.