Complex sentence: The city was restored by Nabopolassar and his son Nebuchadnezzar II. It took 88 years to rebuild the city; its central feature was the temple of Marduk (Esagila), to which the Etemenanki ziggurat was associated.
Split into simpler sentences: The city was restored by Nabopolassar and his son Nebuchadnezzar II. It took 88 years to rebuild. Its central feature was the temple of Marduk (Esagila), to which the Etemenanki ziggurat was associated.