I really can't stand people on the train who can't sit still in their seats, keep shuffling around in their bags, and work on their laptop while their elbows get in their neighbors' way.
ご質問ありがとうございます。
"I really can't stand people on the train who can't sit still in their seats,"＝「電車で、席に静かに座れない人々が耐えられない」
"keep shuffling around in their bags,"＝「バッグの中をごそごそして」
"and work on their laptop while their elbows get in their neighbors' way."＝「そしてラップトップを使用しながら、肘が隣人の迷惑になっている人達を。」
ご参考に。
アメリカ合衆国 
