Complex sentence: Poorvi Vora of George Washington University stated that vote-scanning machinery could be infected with malware that changes the record of votes, and a manual count of paper ballots would be the only way to know if there had been vote manipulation.
Split into simpler sentences: Poorvi Vora of George Washington University said that vote-scanning machinery could be infected with malware that changes the record of votes. A manual count of paper ballots is the only way to know if there had been vote manipulation.