Complex sentence: Most Arab citizens of Israel are Muslim, particularly of the Sunni branch of Islam, and there is a significant Arab Christian minority from various denominations, numbering 122,000--a majority of Christians in Israel.
Split into simpler sentences: Most Arab citizens of Israel are Muslim, particularly of the Sunni branch of Islam. There is a significant Arab Christian minority from various denominations, numbering 122,000--a majority of Christians in Israel.