Simplify the following text for a Grade 7 native English-speaking person.
Original: Others believe that the delivery text has been lost , because some of the words and phrases of the Nicolay Copy do not match contemporary transcriptions of Lincoln 's original speech .
Simplified: But some of the words and expressions in the Nicolay Copy do not match modern transcriptions of Lincoln 's speech . Because of this , some people believe that the text used at Gettysburg has been lost .