Complex sentence: Minako is Yuri Katsuki's ballet teacher and owner of the local dance studio in Hasetsu, but is currently lacking students, aside for Yuri K., who she still helps in his training.
Split into simpler sentences: Minako is Yuri Katsuki's ballet teacher and owner of the local dance studio in Hasetsu. She is currently lacking students, aside for Yuri K., who she still helps in his training.