It used to be that the pronoun “he” was used indiscriminately for both men and women. However, since women comprise approximately 51% of the US population, they got all uppity several decades ago and decided there had to be a better solution.
To avoid using the awkward “he and she” and “his and her,” you have two easy solutions:
1. Eliminate the pronoun: Instead of “Everyone will receive his or her evaluation at the end of the week,” change it to “Everyone will receive an evaluation.”
2. You can also make the subject plural: “All employees will receive their evaluations at the end of the week.”