Complex sentence: A comprehensive nonviolence action plan, announced by Hanna Siniora and Mubarak Awad in January of 1988, called upon Palestinians to boycott Israeli products and end cooperation with Israel.
Split into simpler sentences: A comprehensive nonviolence action plan was announced by Hanna Siniora and Mubarak Awad in January of 1988. Palestinians were called upon to boycott Israeli products and to end cooperation with Israel.