Complex sentence: In 1964 he moved to the College of the Virgin Islands, and in 1967, to Clark University, where in 1969 he helped establish the Antipode journal and the Union of Socialist Geographers.
Split into simpler sentences: In 1964 he moved to the College of the Virgin Islands. In 1967 he returned to the United States for a position at Clark University, where in 1969 he helped establish the "Antipode Journal" and the Union of Socialist Geographers.