Complex sentence: However, this loss of flight is what causes Kiki, through the help of others in the film, to realize that being vulnerable does not always lead to failure, but rather, can help one learn valuable lessons and better understand one's self.
Split into simpler sentences: However, this loss of flight is what causes Kiki, through the help of others in the film, to realize that being vulnerable does not always lead to failure. Rather, such vulnerability can help one learn valuable lessons and better understand one's self.