Simplify the following text for a Grade 10 native English-speaking person.
Original: Chaldean Christians ( Neo-Aramaic : Ü Ü Ü Ü Ü Ü Ü Ì Ü , are ethnic Assyrian adherents of the Chaldean Catholic Church , most of whom converted to Catholicism from the Church of the East in the 17th and 18th centuries .
Simplified: Chaldean Christians ( Syriac : Ü Ü Ü Ü Ü Ü Ü Ü Keldayee , Arabic : Ø Ù Ù Ù Ø Ø Ù Ù Ù Ù ) are adherents of the Chaldean Catholic Church .