Complex sentence: The exception is the Killer Satellites, which start appearing after the third asteroid belt at the beginning of level four with no warning at all, although the manual stated they appeared at the end of each level, starting with level 4.
Split into simpler sentences: The exception is the Killer Satellites, which start appearing after the third asteroid belt at the beginning of level 4 with no warning at all. The manual incorrectly states that they appear at the end of each level, starting with level 4.