Complex sentence: This law applies between the point at which the bowling arm passes above shoulder height and the point at which the ball is rel some natural flexing of the elbow joint which happens during the course of legal delivery.
Split into simpler sentences: This law applies between the point at which the bowling arm passes above shoulder height and the point at which the ball is released. The limit is to allow some natural flexing of the elbow joint which happens during the course of legal delivery.