Complex sentence: No serious injuries occurred, but the police caught everyone involved for trespassing and later charged eleven fighters with misdemeanors of unlawful boxing, and trespassing, and the creator with the felony of unlawful boxing promotion.
Split into simpler sentences: No serious injuries occurred, but the police held everyone involved for trespassing and later charged eleven fighters with misdemeanors of unlawful boxing and trespassing. In addition, the creator was charged with the felony of unlawful boxing promotion.