Complex sentence: In 2001, Hall's organization of an academic conference on indigenous rights, coinciding with the 3rd Summit of the Americas in Quebec City, led to questioning by the RCMP, which the Canadian Association of University Teachers called a violation of his academic freedom.
Split into simpler sentences: In 2001, Hall's organized an academic conference on indigenous rights, coinciding with the 3rd Summit of the Americas in Quebec City. The RCMP questioned him about his activities, which the Canadian Association of University Teachers called a violation of his academic freedom.