Complex sentence: Aronsohn worked on foreign policy and national security issues in Clinton's State Department.While here, he worked on a wide range of international security matters including nonproliferation, arms control, peacekeeping, and Middle East policy.
Split into simpler sentences: Aronsohn worked on foreign policy and national security issues in Clinton's State Department. While there, he worked on a wide range of international security matters including nonproliferation, arms control, peacekeeping, and Middle East policy.