A term or phrase for speaking as clearly as possible to non-experts [duplicate]

How can I describe the difficulty of somebody who is trying to explain something to people who are not in his/her professional field, and is afraid of using professional terms that will be unclear to his/her listeners?

In my native language, I would say "it is hard to go out of the professional circle". How can I say it in English?

An example:

I have tried my best to explain this subject as clearly as possible, but it is hard to______

I do not think my question is a duplicate because I looked for a term expressing a difficulty of explaining. I didn't get a direct answer, so I deduced there is no such a term.

Solution 1:

... hard to explain in layman's terms:

simple language that anyone can understand

^{Merriam-Webster}

Solution 2:

Plain English

I have tried my best to explain this subject as clearly as possible, but it is hard to express in plain English.

I would fully support the answer from @sxpmaths, "Layman's terms" is an excellent phrase to describe just this.

I have, however, spent almost twenty years doing what you describe in your question, trying to explain technical information to laypersons, and some of them take offence at the term. It's not any fault of the terminology, someone who doesn't know what "layman" means may consider it condescending (I've never used it in that manner). I've had to beg the forgiveness of people to save contracts because they thought I was using some insulting computer jargon (it's actually an ecclesiastical term, referring to someone who is unordained preaching a sermon).

Because of this, unless I know my audience, I do make sure to use nothing but very plain English. Not "talking to small children English", just plain English. And I have found it is best to refer to it in such terms.

Solution 3:

Speak in plain language:

language that is clear and easy to understand, with no ambiguity or unnecessarily difficult words.

• Use plain language instead of jargon. A booklet summarizing the scheme in plain language

(Collins Dictionary)