Complex sentence: The new city kept many of the first city exterior features including the internal rampart and gate, in addition to the outer circular embankment measuring 1.9 km in diameter, which was topped by a wall two meters thick, and suitable for the protection of archers.
Split into simpler sentences: The new city kept many of the first city exterior features, including the internal rampart and gate. Also kept, the outer circular embankment measuring 1.9 km in diameter, which was topped by a wall that is two meters thick, suitable for the protection of archers.