Simplify the following text for a Grade 7 native English-speaking person.
Original: The Oklahoma City bombing of April 19 , 1995 , in which Timothy McVeigh and Terry Nichols detonated an explosive outside of the Alfred P. Murrah Federal Building , killed 168 people including 19 children .
Simplified: On April 19 , 1995 , the Alfred P. Murrah Federal Building in Oklahoma City was bombed by Timothy McVeigh . 168 people were killed in the bombing .