What type of sentence is this? satire is writing that mocks human weakness in order to instigate change one example is political cartoons which appear in newspapers daily

This is a declarative sentence, we can see that through the purpose of the sentence.

We can arrive at this answer because:

A declarative sentence is one whose objective is to present something to the reader.In this case, declarative sentences have the purpose of informing, showing how something works, or what it represents, without presenting opinions, orders or surprises.

The sentence shown in the question above is intended to show the reader what satire is and inform the reader what satire presents and how we can recognize it.

More information:

Atahualpaemperor of the inca empire who rose to the throne after winning a civil war between him and his brother.  -he refused to become a spanish vassal or christian.-francisco pizarro kidnapped him and demanded a huge ransom.  -pizarro's secretary described him as "a man of thirty years, good-looking and poised, somewhat stout, with a wide, handsome, and ferocious face, and the eyes flaming with blood."-after the ransom was paid, atahualpa was killed by pizarro