Complex sentence: Some time later, Tierney was approached by a female fan for an autograph at a garden party who revealed that during WWII she had sneaked out of quarantine while sick with German measles to visit the Hollywood Canteen and meet Tierney.
Split into simpler sentences: Some time later Tierney was approached by a female fan for an autograph at a garden party. The woman revealed that she had sneaked out of quarantine to the Hollywood Canteen while sick with German measles to meet Tierney.