Complex sentence: Brown, a graduate of Harvard University and proponent of the ideas of Booker T. Washington, was dedicated to improving the quality of life for African Americans in Dallas County during the Jim Crow era of racial segregation.
Split into simpler sentences: Brown, a graduate of Harvard University and proponent of the ideas of Booker T. Washington. He was dedicated to improving the quality of life for African Americans in Dallas County during the Jim Crow era of racial segregation.