Complex sentence: He goes into the music room and attempts to rape Mu Cheng, but is caught by Mu Cheng's stepmother and Guang Xi. Mu Cheng's stepfather tries to blame it on Mu Cheng, but Guang Xi knows that he is lying and the school gets involved.
Split into simpler sentences: He goes into the music room and attempts to rape Mu Cheng. He is caught by Mu Cheng's stepmother and Guang Xi. Mu Cheng's stepfather tries to blame it on Mu Cheng, but Guang Xi knows that he is lying and the school gets involved.