Original sentence: The Gaza flotilla raid occurred on 31 May 2010 in international waters of the Mediterranean Sea, when Israeli naval forces seized an aid convoy of six ships carrying 663 humanitarian and pro-Palestinian activists  from 37 nations,  known as the Gaza Freedom Flotilla
Edited sentence: The Gaza flotilla raid occurred on 31 May 2010 in international waters of the Mediterranean Sea, when Israeli naval forces seized an aid convoy of six ships carrying 663 pro-Palestinian activists  from 37 nations,  known as the Gaza Freedom Flotilla