Complex sentence: After his studies, Rayan returned to Gaza and became a professor of Islamic law at the Islamic University of Gaza, and a preacher at several local mosques, Jabalia's Imad Aqil Mosque (also known as the "Mosque of martyrs") among them.
Split into simpler sentences: After his studies, Rayan returned to Gaza and was employed as a professor of Islamic law at the Islamic University of Gaza. He also became a preacher at several local mosques, Jabalia's Imad Aqil Mosque (also known as the "Mosque of martyrs") among them.