Complex sentence: He loses interest in the circus and during a sea voyage, when a storm hits, he appears unconcerned about the animals' well-being, causing Naruto to become disgusted at his lack of value for them.
Split into simpler sentences: He loses interest in the circus and during a sea voyage. When a storm hits, he appears unconcerned about the animals' well-being, causing Naruto to become disgusted at his lack of value for them.