Complex sentence: The crown attorney's objective is to prove the guilt, and prosecute the defendant for the crime he or she has been charged with, to do this, the crown must prove beyond a reasonable doubt that the defendant did commit the crime.
Split into simpler sentences: The crown attorney's objective is to prove the guilt, and prosecute the defendant for the crime he or she has been charged with. To do this, the crown must prove beyond a reasonable doubt that the defendant did commit the crime.