Complex sentence: In 1210 John fined de Neville 1000 marks because he had allowed Peter des Roches, the Bishop of Winchester to enclose some hunting grounds without royal permission; although des Roches was close to the king, that was an infringement of the royal forests.
Split into simpler sentences: In 1210 John fined de Neville 1000 marks because he had allowed Peter des Roches, the Bishop of Winchester to enclose some hunting grounds without royal permission. Although des Roches was close to the king that was an infringement of the royal forests.