I disagree with that. I understand what you're saying, but that doesn't justify the weird "easy but conplex" statement.

That's like saying that differential equations are both easy and complex because it involves adding (a simple math operation), and calculus (infinite sums.)

The compounding of "simple" operations is also math. You have to know what you're doing. Not everyone can do this, or learn it in a carefree afternoon. So rocket science math is far from easy.

Edit: downvoters, are any of you a mathematician? Don't just downvote. School me!