Complex sentence: The effect is not so apparent during the landing rollout and flare given the relatively low power setting, however should the throttle be suddenly advanced with the tail-wheel in contact with the runway then anticipation of this nose-left tendency is prudent.
Split into simpler sentences: The effect is not so apparent during the landing rollout and flare, given the relatively low power setting. However, should the throttle be suddenly advanced with the tail-wheel in contact with the runway, then anticipation of this nose-left tendency is prudent.