Simplify the following text for a Grade 12 native English-speaking person.
Original: Following the al-Askari Mosque bombing in February 2006 , imams and other Islamic leaders used mosques and Friday prayers as vehicles to call for calm and peace in the midst of widespread violence .
Simplified: After the al-Askari Mosque bombing in February 2006 , imams and other Islamic leaders used mosques and Friday prayers to call for calm and peace during the widespread violence .