Complex sentence: In this position, O'Leary won praise for declassifying old Department of Energy documents, including Cold War-era records that showed the U.S. government had used American citizens as guinea pigs in human radiation experiments, as had long been rumored.
Split into simpler sentences: In this position, O'Leary won plaudits for declassifying old Department of Energy documents. Among the documents declassified were Cold War-era records which showed the U.S. Government had used American citizens as guinea pigs in human radiation experiments, as had long been rumored.