Original: Hindenburg was now lapsing in and out of senility and wanted to leave office, but he was persuaded to run for re-election in 1932 by the Kamarilla and the pro-republican parties who considered him the only candidate who could defeat Hitler.
Simplified: He was 84 years old and in poor health, but had to run for re-election in 1932 as the only candidate who could defeat Adolf Hitler.