Original sentence: Manning is an army specialist who allegedly confessed to Lamo that he had provided embarrassing video footage to Wikileaks concerning the July 12, 2007 Baghdad airstrike collateral damage incident in Iraq, along with allegedly leaking thousands of pages of classified data, though the latter has been denied by Wikileaks
Edited sentence: Manning is an army specialist who allegedly confessed to Lamo that he had provided embarrassing video footage to Wikileaks concerning the July 12, 2007 Baghdad airstrike collateral damage incident in Iraq, along with leaking & mishandling thousands of pages of classified data