Original sentence: Though the boarding of five of the ships passed without serious incident, the boarding of the MV Mavi Marmara turned deadly when activists aboard the ship clashed with the Israeli landing party immediately after the latter rappelled onto the deck from helicopters
Edited sentence: Though the boarding of five of the ships passed without serious incident, the boarding of the MV Mavi Marmara turned deadly when activists aboard the ship clashed violently with the Israeli landing party immediately after the latter rappelled onto the deck from helicopters