Complex sentence: On March 22,2013, Muhammad Issa al-Bakr and Mansour bin Rashed al-Matroushi were arrested over a threatening letter sent to the French embassy in protest of the country's intervention in Mali.
Split into simpler sentences: On March 22,2013, Muhammad Issa al-Bakr and Mansour bin Rashed al-Matroushi were arrested. They were accused of sending a threatening letter sent to the French embassy in protest of France's presence in Mali.