There is no way of knowing whether the employees are actually working as they should be, because they are working from home.
ご質問ありがとうございます。
"There is no way of knowing"＝「知る術がありません」
"whether the employees are actually working as they should be,"＝「従業員たちが実際、ちゃんと働いているかどうか」
"because they are working from home."＝「なぜかというと、彼らはリモートで働いているからです。」
ご参考までに。
アメリカ合衆国 
