Complex sentence: Although the Izz al-Din al-Qassam Brigades are an integral part of Hamas, the exact nature of the relationship is hotly debated: they appear to operate at times independently of Hamas, exercising a certain autonomy.
Split into simpler sentences: Although the Izz al-Din al-Qassam Brigades are an integral part of Hamas, the exact nature of the relationship is hotly debated. They appear to operate at times independently of Hamas, exercising a certain autonomy.