instruction:
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.
question:
In 1990 at the age of 29 , she became one of their first female partners .
answer:
In 1990 , she was admitted as a partner ; at the age of 29 , she was the youngest partner within the firm , and one of the first women to hold the position .


question:
It is used as a reinforcing material for many polymer products .
answer:
Glass fibers are therefore used as a reinforcing agent for many polymer products ; to form a very strong and relatively lightweight fiber-reinforced polymer ( FRP ) composite material called glass-reinforced plastic ( GRP ) , also popularly known as " fiberglass " .


question:
The main tengwar letters are placed into four vertical series ( " te ́ mar " ) and six horizontal rows ( " tyeller " ) .
answer:

These principal letters are divided into four series ( " te ́ mar " ) that correspond to the main places of articulation and into six grades ( " tyeller " ) that correspond to the main manners of articulation .