Complex sentence: The rise of Shamshi-Adad I of Assyria proved more dangerous to Yamhad than Mari, the Assyrian king was an ambitious conqueror with the aim to rule Mesopotamia and the Levant calling himself king of the World.
Split into simpler sentences: The rise of Shamshi-Adad I of Assyria proved more dangerous to Yamhad than Mari. The Assyrian king was an ambitious conqueror with the aim to rule Mesopotamia and the Levant, and called himself king of the World.