Simplify the following text for a Grade 5 native English-speaking person.
Original: The amendment requires the new Senator to be from the same party as the old one and would have prevented the appointment by Lewis , but not that by Bjelke-Petersen .
Simplified: The change means a new Senator has to be from the same party as the old one . This would have prevented the appointment by Lewis , but not that by Bjelke-Petersen .