Complex sentence: He, along with three other members, left the organization in 1993 and helped form the Muslim anti-apartheid group Muslims Against Oppression, which later changed its name to Call of Islam, which became an important affiliate of the United Democratic Front.
Split into simpler sentences: He, along with a group of three other members of the movement, left the organization in 1993 and helped form the Muslim anti-apartheid group Muslims Against Oppression, which later changed its name to Call of Islam. The Call of Islam became an important affiliate of the United Democratic Front.