Complex sentence: After the battle of Muzayyah, the surviving Christian Arabs and Persian soldiers joined the Arab army at Saniyya and were destroyed later in the battle of Saniyya and battle of Zumail.
Split into simpler sentences: After the battle of Muzayyah, the surviving Christian Arabs and Persian soldiers joined the Arab army at Saniyya. They were destroyed later in the battle of Saniyya and the battle of Zumail.