Simplify the following text for a Grade 10 native English-speaking person.
Original: The first part of the atlas contains copper plate prints depicting the world systems of Claudius Ptolemy , Nicolaus Copernicus and Tycho Brahe .
Simplified: The first part of the atlas has copper plate prints showing the universe models of Claudius Ptolemy , Nicolaus Copernicus and Tycho Brahe .