Complex sentence: Simon learns that he has awoken in the year 2104, and that one year prior, a massive comet impact devastated Earth's surface, leaving PATHOS-II as the last outpost of humanity.
Split into simpler sentences: Simon learns that he has awoken in the year 2104. In 2103, a massive comet impact devastated Earth's surface, leaving PATHOS-II as the last apparent outpost of humanity.