Complex sentence: The ship was carrying a hoard of gold belonging to Clive of India, that was controversially looted in modern times by treasure hunters, resulting in recent changes to international maritime treaties to better protect underwater cultural heritage.
Split into simpler sentences: The ship was carrying a hoard of gold belonging to Clive of India, which modern treasure hunters looted. The controversy over these depredations resulted in changes to international maritime treaties to better protect underwater cultural heritage.