Complex sentence: The release rule is rarely enforced in club play unless abuse is suspected, however in major tournaments it is strictly enforced; the "eye on the hog" sensor in the stone will indicate whether the stone has been legally thrown or not.
Split into simpler sentences: The release rule is rarely enforced in club play unless abuse is suspected. However, in major tournaments it is strictly enforced; the "eye on the hog" sensor in the stone will indicate whether the stone has been legally thrown or not.