Original sentence: , and (3) less need for special education than classmates who were retained as kindergartners ..  However, there is also evidence that some first through third-graders who were redshirted as children required greater use of special education services than their non-redshirted and non-retained classmates ...Researchers have observed other effects of redshirting within the first three years of elementary school, including (1) academic achievement that is nearly equal to that of their grade-level peers , (2) a lower likelihood of receiving "negative feedback from teachers about their academic performance or conduct in class"
Edited sentence: However, there is also evidence that some first through third-graders who were redshirted as children required greater use of special education services than their non-redshirted and non-retained classmates.Researchers have observed other effects of redshirting within the first three years of elementary school, including (1) academic achievement that is nearly equal to that of their grade-level peers , (2) a lower likelihood of receiving "negative feedback from teachers about their academic performance or conduct in class" , and (3) less need for special education than classmates who were retained as kindergartners