Complex sentence: Most of how Muslims picture and think about Jahannam comes from the Qur'an, according to scholar Einar Thomassen, who found nearly 500 references to Jahannam in the Qur'an.
Split into simpler sentences: Most of how Muslims picture and think about Jahannam comes from the Qur'an, according to scholar Einar Thomassen. Thomassen has found nearly 500 references to Jahannam in the Qur'an.