训话 means giving a serious, often critical talk to one's subordinates — like a boss, teacher, or military commander lecturing a group. It's a separable verb (离合词): when you quantify or modify the action, the verb and object split, e.g. 训了一个小时的话 ('lectured for an hour') or 训了三次话 ('gave three lectures'). You typically hear it in school, workplace, or army settings where someone in authority addresses those below them.