Complex sentence: The law was primarily aimed at eliminating parochial schools, including Catholic schools, and was promoted by groups such as the Knights of Pythias, the Federation of Patriotic Societies, the Oregon Good Government League, the Orange Order, and the Ku Klux Klan.
Split into simpler sentences: The law was primarily aimed at eliminating parochial schools, including Catholic schools. It was promoted by groups such as the Knights of Pythias, the Federation of Patriotic Societies, the Oregon Good Government League, the Orange Order, and the Ku Klux Klan.