Complex sentence: Gipper went to the Hopi reservation to collect data for a general critique of Whorf's principle of linguistic relativity published in 1972, which included also a refutation of Whorf's Hopi arguments.
Split into simpler sentences: Gipper went to the Hopi reservation to collect data for a general critique of Whorf's principle of linguistic relativity published in 1972. His critique included a refutation of Whorf's Hopi arguments.