It came about in this way.
This is how the incident happened.
This is how it happened.
That is how it happened.
This was something that happened necessarily.
How did it come about?
How did it come about?
That became like this because of some reasons.
It happened completely by accident.
What followed was unpleasant.
That should not have happened.
It was a later event―a subsequent event.
This is how it started.
This kind of phenomenon occurred there.
What happened next was terrible.
To tell the truth, this is how it happened.