Complex sentence: The most thorough analysis of the Hopi language is Benjamin Whorf's study of Mishongnovi Hopi, which was based primarily on a single off-reservation informant but later checked by other reservation speakers.
Split into simpler sentences: The most thorough analysis of the Hopi language is Benjamin Whorf's study of Mishongnovi Hopi. His work was based primarily on a single off-reservation informant, but it was later checked by other reservation speakers.