Complex sentence: In "Our Jungle Diplomacy," Sands noted that United States policy in South America was creating a perception among Latin Americans that the U.S. was intending to absorb their continent, which the Japanese took as a precedent to justify their own imperialistic plans in Asia.
Split into simpler sentences: In "Our Jungle Diplomacy," Sands pointed out that United States policy in South America was creating a perception among Latin Americans that the U.S. was intending to absorb their continent. He noted that the Japanese took US foreign policy in the region as a precedent to justify their own imperialistic plans in Asia.