Complex sentence: The wreck drifts into a large-scale starship-battle near Earth, which is under attack by the fleet of the Mars Regulator and his right hand Jens Maul, who suffers from asthma.
Split into simpler sentences: The wreck drifts into a large-scale starship-battle near Earth. Earth is under attack by the fleet of the Mars Regulator and his right hand Jens Maul, who suffers from asthma.