Complex sentence: Sunni Muslims who identify as Arabs form 60% of the population and this category is designated for "Arab Sunni Muslim communities" in Syria, but also includes sub-categories for Kurdish, Turkmen and Circassian communities, all of which are overwhelmingly Sunni Muslim.
Split into simpler sentences: Sunni Muslims who identify as Arabs form 60% of the population. This category is designated for "Arab Sunni Muslim communities" in Syria, but also includes sub-categories for Kurdish, Turkmen and Circassian communities, all of which are overwhelmingly Sunni Muslim.