sentences:  He was well known for his unique pitching motion during his years with the Buffaloes, letting his throwing arm hang at his side while he raised his left leg, lowered it halfway once, then raised it again before driving towards the plate.He was forced to overhaul his mechanics and implement a more orthodox delivery when the NPB changed its rules on pitching motions in the 2005 off-season, taking a stricter stance on so-called two-stage motions (those with pauses or breaks at any point in the delivery).In 2008, Iwakuma also raised his arm slot slightly to induce more movement in his offspeed pitches.