How can I make my text based game more readable/organized?

So I have a problem. I am a new C++ coder, and I've been trying to make a text based game recently (I heard it was simple). But I've always ended up with a bunch of if-statements, while loops, etc., making it very hard to read.

Is there any better way of formatting your code? And if so, could I use an alternative function to help me with organization?

Here is what my code looks like (it goes on and on looking like this):

if (action == 1)
{
    cout << "You have passed! What do you do?" << endl;
    cin >> action;

    if (action == 1)
    {
        cout << "Correct!" << endl;
    }
    else
    {
        cout << "Wrong!" << endl;

    }

}
else
{
    cout << "You have failed!" << endl;
}