In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

[Q]: Hypothyroidism , also called underactive thyroid or low thyroid , is a disorder of the endocrine system in which the thyroid gland does not produce enough thyroid hormone .
[A]: If a person has hypothyroidism , their thyroid gland does not make enough hormones .

[Q]: The Roman Kingdom , also referred to as the Roman monarchy , or the regal period of ancient Rome , was the earliest period of Roman history , when the city and its territory were ruled by kings .
[A]: The Roman Kingdom was the monarchical government of the city of Rome and its territories .

[Q]: A card game is any game using playing cards as the primary device with which the game is played , be they traditional or game-specific .
[A]:
A card game is any game played with playing cards .