Complex sentence: The "Rama" of the title is an alien star ship, initially mistaken for an asteroid categorised as "31/439", it is detected by astronomers in the year 2130 while still outside the orbit of Jupiter.
Split into simpler sentences: The "Rama" of the title is an alien star ship, initially mistaken for an asteroid categorised as "31/439". It is detected by astronomers in the year 2130 while still outside the orbit of Jupiter.