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.

A mercury-arc valve or mercury-vapor rectifier or ( UK ) mercury-arc rectifier is a type of electrical rectifier used for converting high-voltage or high-current alternating current ( AC ) into direct current ( DC ) .
A Mercury-arc rectifier is a type of rectifier used for converting alternating current ( AC ) to direct current ( DC ) .

As a means of recording the passage of time , the 14th century was a century lasting from January 1 , 1301 , to December 31 , 1400 .
The 14th century is the century from 1301 to 1400 .

The NXT Tag Team Championship is a professional wrestling tag team championship created and promoted by the American professional wrestling promotion WWE for their NXT brand .

The NXT Tag Team Championship is a professional wrestling championship in the WWE .