Complex sentence: Hot periods typically last a few minutes, and most do not lead to an eruption; the hot period ends, activity on the Platform returns to normal, and it may be tens of minutes to hours before the next hot period occurs.
Split into simpler sentences: Hot periods typically last a few minutes, and most do not lead to an eruption. When the hot period ends, activity on the Platform returns to normal, and it may be tens of minutes to hours before the next hot period occurs.