Complex sentence: He also appeased anti-Catholic, anti-French-Canadian sentiment originating from supporters of the Orange Order in his caucus such as George Howard Ferguson by passing Regulation 17 which banned the teaching of French in schools beyond the first three years of school.
Split into simpler sentences: He also appeased the anti-Catholic, anti-French-Canadian sentiments of supporters of the Orange Order in his caucus (such as George Howard Ferguson) by passing Regulation 17. This regulation banned the teaching of French in schools beyond the first three years of school.