Simplify the following text for a Grade 14 native English-speaking person.
Original: The Act was passed in the British and therefore unrepresentative Irish Parliament with substantial majorities achieved in part ( according to contemporary documents ) through bribery , namely the awarding of peerages and honors to critics to get their votes .
Simplified: Substantial majorities were achieved , and according to contemporary documents this was assisted by bribery in the form of the awarding of peerages and honors to opponents to gain their votes .