Original sentence: It can represent at a glance the initial difficulty of learning something and, to an extent, how much there is to learn after initial familiarity
Edited sentence: The learning curve can also represent at a glance the initial difficulty of learning something and, to an extent, how much there is to learn after initial familiarity.Typically, the sharpest increase in retention of information occurs after the initial attempts, and gradually evens out, meaning that less and less new information is retained after each repetition