Complex sentence: Their initial training sessions go poorly as Kumatetsu does not know how to teach, but Kyûta realizes that he can learn from Kumatetsu by imitating him as he performs household tasks.
Split into simpler sentences: Their initial training sessions go poorly as Kumatetsu does not know how to teach. Later, Kyûta realizes that he can learn from Kumatetsu by imitating him as he performs household tasks.