という理由で

The phrase という理由で, which can literally read as "for the reason of/that", is generally used in writing to present the reason for a state, event, or action. It simply means "because."

登録した学生が少ないという理由で、その授業はキャンセルされてしまいました。
Because not many students registered, that class has unfortunately been cancelled.

リーさんは雨が嫌いだったという理由で、うちに行って部屋で泣いたんだ。
Because Lee-san hated the rain, he went home and cried in his room.

このゲーム機は、安くて使いやすいという理由で、よく売れているそうだ。
I hear that because this game console is inexpensive and easy to use, it's selling well.

アルバイトで忙しいという理由で、学校を休む学生がいます。
There are students who skip school because they are busy at work.