Complex sentence: All the tasks are delivered in an envelope with a wax seal, which the player reads aloud and the timer/task is then started, normally after the challenger reads out the words: "Your time starts now", or when Alex blows a whistle.
Split into simpler sentences: All the tasks are delivered in an envelope with a wax seal, which the player reads aloud, and the timer/task is then started. Time normally stars after the challenger reads out the words: "Your time starts now", but it can also start when Alex blows a whistle.