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.

[EX Q]: In chemistry and physics , activation energy is the energy which must be provided to a chemical or nuclear system with potential reactants to result in : a chemical reaction , nuclear reaction , or various other physical phenomena .
[EX A]: The activation energy of a chemical reaction is the minimum energy that is needed to make the reaction happen .

[EX Q]: Center ( C ) is a position in American football and Canadian football ( in the latter the position is spelled centre , following Commonwealth spelling conventions ) .
[EX A]: Center ( C ) is a position in American football and Canadian football .

[EX Q]: A Horn clause with exactly one positive literal is a definite clause or a strict Horn clause ; a definite clause with no negative literals is sometimes called a unit clause , and a unit clause without variables is sometimes called a fact ; and a Horn clause without a positive literal is sometimes called a goal clause ( note that the empty clause consisting of no literals is a goal clause ) .
[EX A]:
A Horn clause with exactly one positive literal is a definite clause ; a definite clause with no negative literals is sometimes called a " fact " ; and a Horn clause without a positive literal is sometimes called a goal clause .