Complex sentence: According to a near contemporary source, over five hundred people lost their lives in the Scottish victory over the Manx, and it is not certain whether Guðrøðr escaped with his life or if he was among the slain.
Split into simpler sentences: According to a near contemporary source, over five hundred people lost their lives in the subsequent Scottish invasion and suppression of the Manx. It is not certain whether Guðrøðr escaped with his life or if he was among the slain.