Complex sentence: Since 1999, Marks has also been a member of the Senior Steering Committee of the Center for Strategic and International Studies (CSIS) Transnational Threats Project focusing on the application and use of cyber space by international organized crime and Islamic terrorist groups.
Split into simpler sentences: Since 1999, Marks has also been a member of the Senior Steering Committee of the Center for Strategic and International Studies (CSIS) Transnational Threats Project. There he focuses on the application and use of cyber space by international organized crime and Islamic terrorist groups.