Simplify the following text for a Grade 7 native English-speaking person.
Original: The Chaldean Catholic Church or the Chaldean Church of Babylon ( , ' ) is an Eastern particular church of the Catholic Church , maintaining full communion with the Bishop of Rome and the rest of the Catholic Church . The Chaldean Catholic Church presently comprises an estimated 600,000 - 700,000 Chaldean Christians .
Simplified: This time was anyway a period of expansion for the Chaldean Catholic Church .