Compared to the northern hemisphere, the southern hemisphere of Mars has seasons that are a. colder in winter but cooler in summer than in the North.
(the southern hemisphere of Mars; has; seasons that are a. colder in winter but cooler in summer than in the North) (seasons; are; a. colder in winter but cooler in summer than in the North)
the southern hemisphere of Mars seasons
has are
seasons that are a. colder in winter but cooler in summer than in the North
a. colder in winter but cooler in summer than in the North