Complex sentence: In 2017, the Tet arrived in orbit and destroyed the Moon, to devastate and disorient the human population: massive tsunamis and earthquakes destroyed most major cities, and millions more starved to death in the chaos.
Split into simpler sentences: In 2017, the Tet arrived in orbit and destroyed the Moon, to devastate and disorient the human population. Massive earthquakes and tsunamis than destroyed most major cities, and millions more starved to death in the chaos.