Complex sentence: Because of its anonymous membership, lack of organization and leaderless nature, sources differ as to the goals or mission of Gamergate and, wiith no person or group able to speak for the Gamergate, defining it has been difficult.
Split into simpler sentences: Because of its anonymous membership, lack of organization and leaderless nature, sources widely differ as to the goals or mission of Gamergate. With no single person or group able to speak for the Gamergate, defining it has been difficult.