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.
Q: With Anterograde amnesia , the longer-term memories from the time before the event remain intact .
A: 
Anterograde amnesia is a loss of the ability to create new memories after the event that caused amnesia , leading to a partial or complete inability to recall the recent past , while long-term memories from before the event remain intact .