Complex sentence: She developed feelings for Kou after they became friends in school and during the Minkei training and admitted to herself that she was in love with him after the strip ping pong match with Shikie (which they both lost when Fujita joined).
Split into simpler sentences: She developed feelings for Kou after they became friends in school and during the Minkei training. She admitted to herself that she was in love with Kou after the strip ping pong match with Shikie (which they both lost when Fujita joined).