Complex sentence: During the early 1920s, al-Qassam taught at the Madrasa Islamiya, an Islamic educational institution with many schools in Haifa and its periphery, funded by the Jamiat Islamiya, a "waqf" (religious trust) run by prominent Muslims from the city.
Split into simpler sentences: During the early 1920s, al-Qassam taught at the Madrasa Islamiya, an Islamic educational institution with many schools in Haifa and its periphery. It was funded by the Jamiat Islamiya, a "waqf" (religious trust) administered by prominent Muslims from the city.