Complex sentence: Unlike the Sumerians, the Hyksos had horse-drawn chariots and not donkeys, they wore mailed shirts and metal helmets they were also armed with superior daggers and swords.
Split into simpler sentences: Unlike the Sumerians, the Hyksos had horse-drawn chariots and not donkeys, they wore mailed shirts and metal helmets. They were also armed with superior daggers and swords.