Complex sentence: When attempting to throw a grenade (which usually appears with a face and, in English, begins a countdown) sometimes it will appear as usual, but begin a countdown that sounds like German, but has no logical numerical pattern.
Split into simpler sentences: When attempting to throw a grenade, it usually appears with a face and, in English, begins a countdown. At a seemingly randomised throw, it will appear as per usual, but begin a countdown that sounds like German, but unfortunately has no seemingly logical numerical pattern.