Complex sentence: The Southern Poverty Law Center (SPLC) is an American nonprofit civil rights organization noted for its legal victories against white supremacist groups, its legal representation for victims of hate groups, its classification of militias and extremist organizations, and its educational programs that promote tolerance.
Split into simpler sentences: The Southern Poverty Law Center (SPLC) is an American nonprofit legal advocacy organization specializing in civil rights and public interest litigation. It is noted for its legal victories against white supremacist groups, its legal representation for victims of hate groups, its classification of militias and extremist organizations, and its educational programs that promote tolerance.