Complex sentence: The incident was witnessed by an American employee of the UNRWA (United Nations Relief and Works Agency for Palestinian Refugees), Catherine Striker, who was accused of failing to intervene or to summon help for Weisbrod.
Split into simpler sentences: The incident was witnessed by an American employee of the UNRWA (United Nations Relief and Works Agency for Palestinian Refugees), Catherine Striker. She was accused of failing to intervene or to summon help for Weisbrod.