Things don't turn out the way one expects them to.
Things don't always go as planned, so one must separate the ideal situation from the reality.
ご質問ありがとうございます。
① "Things don't turn out the way one expects them to."＝「物事は期待通りにはならない。」
② "Things don't always go as planned,"＝「物事は予定通りにはいつもならない」
"so one must separate the ideal situation from the reality."＝「だから理想の状況と現実とを切り離さなければいけない。」
ご参考に。
アメリカ合衆国 
