Complex sentence: Neji explains that he had a reason not to lose; since he is considered a genius, there are people relying strongly on him and his capability, and failure is not an option and quotes Naruto's quote You are different from me.
Split into simpler sentences: Neji explains that he had a reason not to lose; since he is considered a genius, and since there are people relying strongly on him and his capability, failure is not an option. He quotes Naruto's quote You are different from me.