Complex sentence: The Virgin New Adventures novel "Lungbarrow" by Marc Platt provides some additional history on the Hand during the early years of its creation on Gallifrey; namely that it was hidden by Rassilon, and that it escaped just before the Doctor left Gallifrey.
Split into simpler sentences: The Virgin New Adventures novel "Lungbarrow" by Marc Platt provides some additional history on the Hand during the early years of its creation on Gallifrey. The Hand was hidden by Rassilon, but escaped just before the Doctor left Gallifrey.