Original sentence: Based largely on the principles of Islamic fundamentalism gaining momentum throughout the Arab world in the 1980s, Hamas was founded in 1987 (during the First Intifada) as an offshoot of the Egyptian Muslim Brotherhood
Edited sentence: Based largely on the principles of Islamic fundamentalism gaining momentum throughout the Arab world in the 1980s, Hamas was founded in 1987 (during the First Intifada) as an offshoot of the Egyptian Muslim Brotherhood, and grew with Israeli encouragement to create a division in the Palestinian people