Complex sentence: When the Protoss turned on their Xel'Naga teachers and initiated the Aeon of Strife the planet suffered tremendous damage, though with the conflict's resolution the Protoss were able to rebuild and use the planet to expand outwards, colonizing other worlds.
Split into simpler sentences: When the Protoss turned on their Xel'Naga teachers and initiated the Aeon of Strife. The planet suffered tremendous damage, though with the conflict's resolution the Protoss were able to rebuild and use the planet to expand outwards, colonizing other worlds.