Complex sentence: Segregated public schools were declared unconstitutional in 1954 by a unanimous Supreme Court ruling in Brown v. Board of Education, but the Boy Scouts of America included racially segregated units as late as 1974.
Split into simpler sentences: Segregated public schools were been declared unconstitutional 1954 by the unanimous Supreme Court ruling in Brown v. Board of Education. The Boy Scouts of America still included racially segregated units as late as 1974.