Simplify the following text for a Grade 10 native English-speaking person.
Original: The declaration was later extended to exclude not only James and his heirs ( other than Anne ) from the throne , but all Catholics , since `` it hath been found by experience that it is inconsistent with the safety and welfare of this Protestant kingdom to be governed by a papist prince '' .
Simplified: The declaration was later extended to take out all Catholics . This was because `` it hath been found ( discovered ) by experience that it is inconsistent ( not in harmony ) with the safety and welfare of this Protestant kingdom to be governed by a papist prince '' .