Original sentence: "Cross-age mentoring can be distinguished from peer mentoring by the fact that the mentor is in a higher grade level and/or is slightly older then the mentoree in the former case, whereas students of the same age are paired together based on varying levels of achievement in the latter case.Despite this important distinction, the terms cross-age mentoring and peer mentoring are often used interchangeably, and are sometimes also referred to as peer teaching, peer education, partner learning, peer coaching, and cooperative learning
Edited sentence: " Cross-age mentoring can be distinguished from peer mentoring by the fact that the mentor is in a higher grade level and/or is slightly older then the mentoree in the former case, whereas students of the same age are paired together based on varying levels of achievement in the latter case