Simplify the following text for a Grade 10 native English-speaking person.
Original: These paintings were hugely popular among visitors , and Knight continued to work with the museum well until the 1930s , painting what would become some of the worldâ s most celebrated images of dinosaurs , prehistoric mammals , and prehistoric humans .
Simplified: These paintings were hugely popular among visitors , and Knight continued to work with the museum well into the 1930s . He painted what would become some of the most celebrated images of dinosaurs , prehistoric mammals , and prehistoric humans .