Complex sentence: In 2002, Carville worked as a Greenberg Carville Shrum (GCS) strategist to help American-educated Bolivian Gonzalo Sánchez de Lozada win the presidency in Bolivia, which was portrayed in the documentary "Our Brand Is Crisis".
Split into simpler sentences: In 2002, Carville helped Bolivian Gonzalo Sánchez de Lozada win the presidency in Bolivia, while worked as a Greenberg Carville Shrum (GCS) strategist. This was portrayed in the documentary "Our Brand Is Crisis".