Complex sentence: Sources close to the family said that at one point they believed he was kidnapped by Shabiha militia, a group loyal to Syrian President Bashar Assad, and he was held in a Syrian Air Force Intelligence complex in Damascus.
Split into simpler sentences: Sources close to the family said that at one point they believed he was kidnapped by Shabiha militia, a group loyal to the Syrian regime. He was later reportedly held in a Syrian Air Force Intelligence complex in Damascus.