The computer field is only complicated because it has had time to evolve in many directions. At its heart it is just about machines that compute.

My favorite very basic computer is Harry Porter's Relay Computer. It gives a flavor of how a computer works at the base level. Then you can start to appreciate why things like languages and operating systems are needed.

The thing is, it's hard to understand anything without understanding what needs it. Good luck, and don't just read stuff. Do stuff.