Sole sufficient operator

Well kiddo, have you ever played with a toy that needs batteries to work? Like a remote control car or a robot toy? The batteries are a source of energy that makes the toy move or do something.

Similarly, in big machines or factories, there are also things called "operators" that make them work. The operator is like the person who controls the toy or the remote control car, but they use knobs and buttons to control the machine.

Now, sometimes there can be more than one operator working on a machine or a factory. But a "sole sufficient operator" is someone who can do everything by themselves without needing anyone else's help.

It's like if you learned how to brush your teeth by yourself and you don't need your parents to help you anymore. You are the sole sufficient operator of your toothbrush!

So, a sole sufficient operator is just someone who is in charge of a machine or a factory all by themselves, and they know how to use all the controls and make it work perfectly.