It's a Long story
داستانش مفصله
Something that you say when someone has asked you about something that has happened and you do not want to explain it to them because it would take too long
داستانش مفصله ، قضیه اش مفصله
این هم میگن بعضی مواقع :
It's complicated
@لَنگویچ
قضیش طولانیه