Complex sentence: The group's original aim was to establish an Islamic state in the Sunni-majority regions of Iraq, and following its involvement in the Syrian Civil War this expanded to include controlling Sunni-majority areas of Syria.
Split into simpler sentences: The group's original aim was to establish an Islamic state in the Sunni-majority regions of Iraq. Following its involvement in the Syrian Civil War, this expanded to include controlling Sunni-majority areas of Syria.