Simplify the following text for a Grade 12 native English-speaking person.
Original: Hindenburg hated the idea of Hitler as Chancellor , but under pressure from MeiÃ ner , von Papen and Oskar Hindenburg the President decided to appoint Hitler Chancellor .
Simplified: However , the pressure from MeiÃ ner , Papen and the younger Hindenburg was relentless and by the end of January , the President had decided to appoint Hitler Chancellor .