Complex sentence: Below the mound was found a human bone interred with ashes, a likely indication of cremation, suggesting that this might have been a burial mound, or the individual may have been a victim of human sacrifice.
Split into simpler sentences: Below the mound was found a human bone interred with ashes, a likely indication of cremation. This suggests that this might have been a burial mound, or the individual may have been a victim of human sacrifice.