In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
One example: The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Solution is here: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Explanation: The output sentence elaborates on the input sentence without changing its general meaning e.g. "tetralogy of young adult high fantasy novels".

Now, solve this: In ABC 's " Grey 's Anatomy " , Leigh first appeared as a woman in Joe 's bar who was noticed by Derek Shepherd while in the third-season finale , it was revealed that she was Lexie Grey .
Solution:
In ABC 's medical drama " Grey 's Anatomy " , Leigh first appeared as a woman in Joe 's bar who was noticed by Derek Shepherd during the final two episodes of the third season , and her character is later revealed to be Lexie Grey , the younger half-sister of the titular character .