I wasn't ready to make a sequel until we had a special story worthy of a sequel, until technology evolved, so we can delve deeper into the experience of a fighter pilot.

A sequel is a continuation or part two of something.

To delve deeper means to examine something carefully in order to discover new or more information about it.

I'm very proud of what we all accomplished.

Each one of them are extraordinary.

It still blows my mind that we've done this.

There's nothing like it to accomplish means to achieve or complete something successfully.

If something blows your mind, you're extremely impressed, excited or surprised by it.