Complex sentence: An up-and-coming idol star who has always dreamed of playing for a high school baseball team and going to Kōshien; however, due to the rules of high school baseball in Japan she cannot play on the team.
Split into simpler sentences: An up-and-coming idol star who has always dreamed of playing for a high school baseball team and going to Kōshien. Due to the rules of high school baseball in Japan, however, she cannot play on the team.