Make the text clearer: Although Cosmos and Humboldt's work in general had such a lasting impact on scientific thought, interest in Humboldt's life, work, and ideas over the past two centuries has dwindled in comparison to what it once was.
Cosmos and Humboldt's work in general had such a lasting impact on scientific thought. Interest in Humboldt's life, work, and ideas over the past two centuries has dwindled in comparison to what it once was.