Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Solution: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Reason: 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 instance: State officials in the South took advantage of the decision and began to enact laws that legalized the treatment of blacks as second-class citizens for another seventy years .
Student:
State officials in the South took advantage of the eclipsed role of Congress in the prohibition of racial discrimination and proceeded to embody individual practices of racial segregation into laws that legalized the treatment of blacks as second-class citizens for another seventy years .